Conflict thesis
Encyclopedia
The conflict thesis proposes an intrinsic intellectual conflict between religion
and science
. The original historical usage of the term denoted that the historical record indicates religion’s perpetual opposition to science. Later uses of the term denote religion’s epistemological opposition to science. Also denominated as the Draper–White Thesis, the Warfare Thesis, and the Warfare Model, the conflict thesis interprets the relationship between religion and science
as inevitably leading to public hostility, when religion aggressively challenges new scientific ideas — as in the Galileo Affair
(1614–15).
The historical conflict thesis was a popular historiographical
approach in the history of science
during the late 19th and early 20th centuries, but in its early form is mostly discarded. Despite that, the conflict thesis remains a popular view among the general public and has been recently publicized by the success of Richard Dawkins
' The God Delusion
and other popular books associated with the "New Atheist
" movement.
and the intellectual
Andrew Dickson White
were the most influential exponents of the Conflict Thesis between religion and science. In the early 1870s, Draper was invited to write a History of the Conflict between Religion and Science (1874), a book replying to contemporary papal edicts such as the doctrine of infallibility
, and mostly criticising the anti-intellectualism
of Roman Catholicism, yet he assessed that Islam
and Protestantism
had little conflict with science
. Draper’s preface summarises the conflict thesis:
In 1896, White published the History of the Warfare of Science with Theology in Christendom, the culmination of thirty years of research and publication on the subject, addressing the restrictive, dogmatic forms of Christianity
. In the introduction, White emphasized he arrived at his position after the difficulties of assisting Ezra Cornell
in establishing a university without any official religious affiliation. In The Popes and Science; the History of the Papal Relations to Science During the Middle Ages and Down to Our Own Time (1908), a book dedicated to Pope Pius X, the historian of medicine, James Joseph Walsh
, M.D., criticized White’s scientific perspective as anti-historical:
In God and Nature (1986), David Lindberg
and Ronald Numbers
report that "White's Warfare apparently did not sell as briskly as Draper's Conflict, but in the end it proved more influential, partly, it seems, because Draper's strident anti-Catholicism soon dated his work and because White's impressive documentation gave the appearance of sound scholarship". During the 20th century, historians’ acceptance of the Conflict Thesis declined until rejected in the 1970s, David B. Wilson notes:
said: "White’s and Draper’s accounts of the actual interaction between science and religion in Western history do not differ greatly. Both tell a tale of bright progress continually sparked by science. And both develop and utilize the same myths to support their narrative, the flat-earth legend
prominently among them". In a summary of the historiography
of the Conflict Thesis, Colin Russell
said that "Draper takes such liberty with history, perpetuating legends as fact that he is rightly avoided today in serious historical study. The same is nearly as true of White, though his prominent apparatus of prolific footnotes may create a misleading impression of meticulous scholarship”.
However Gould's stance of Non-overlapping magisteria
has been strongly criticized by Dawkins among others, who asks "If science cannot answer any ultimate question, what makes anybody think that religion can?"
Dawkins also challenges the Christian belief that human beings have been designed, when he points out that "all appearances to the contrary, the only watchmaker in nature is the blind forces of physics".
This line is also taken by Daniel Dennett
in his book Darwin's Dangerous Idea
.
In Science & Religion, Gary Ferngren proposes a more complex relationship, between religion and science, than that proposed by the Conflict Theory:
Some contemporary historians of science, such as Peter Barker, Bernard R. Goldstein
, and Crosbie Smith propose that scientific discoveries, such as Kepler's laws of planetary motion
in the 17th century, and the reformulation of physics in terms of energy
, in the 19th century, were driven by religion. Religious organizations and clerics figure prominently in the broad histories of science, until the professionalization
of the scientific enterprise, in the 19th century, led to tensions between scholars taking religious and secular approaches to nature. Even the prominent examples of religion’s anti-intellectualism
, the Galileo affair
(1614) and the Scopes trial
(1925), were not pure instances of conflict between science and religion, but included personal and political facts in the development of each conflict.
American biologist PZ Myers
actively criticizes supernaturalism, spirituality, intelligent design
, creationism
, and religion in general on his blog Pharyngula
. During the 2010 Global Atheist
Convention he stated:
relates that, unlike among science historians, the theory of a historical, intrinsic and inevitable anti-intellectual
conflict between (Judeo-Christian) religion and science remains popular among the general public, some scientists, and some clerics, and is fanned by current issues like the creation–evolution controversy, stem cell controversy
, and birth control
. Some scholars, such as Brian Stanley and Denis Alexander
, propose that the media are among those responsible for perpetuating the Conflict Theory of hostile relations between religion and science, and the persistence in the popular public mind of "the warfare of science and religion" resulting in such things as medieval
people believing that the Earth was flat
, was first propagated when the conflict thesis originated. David C. Lindberg
and Numbers point out that “there was scarcely a Christian scholar of the Middle Ages who did not acknowledge Earth's
sphericity and even know its approximate circumference". Statements like "the Church prohibited autopsies and dissections during the Middle Ages", "the rise of Christianity killed off ancient science", and "the medieval Christian church suppressed the growth of the natural sciences", are cited by Numbers as other examples of widely popular myths that still pass as historical truth, even though they are not supported by current historical research.
Religion
Religion is a collection of cultural systems, belief systems, and worldviews that establishes symbols that relate humanity to spirituality and, sometimes, to moral values. Many religions have narratives, symbols, traditions and sacred histories that are intended to give meaning to life or to...
and science
Science
Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe...
. The original historical usage of the term denoted that the historical record indicates religion’s perpetual opposition to science. Later uses of the term denote religion’s epistemological opposition to science. Also denominated as the Draper–White Thesis, the Warfare Thesis, and the Warfare Model, the conflict thesis interprets the relationship between religion and science
Relationship between religion and science
The relationship between religion and science has been a focus of the demarcation problem. Somewhat related is the claim that science and religion may pursue knowledge using different methodologies. Whereas the scientific method basically relies on reason and empiricism, religion also seeks to...
as inevitably leading to public hostility, when religion aggressively challenges new scientific ideas — as in the Galileo Affair
Galileo affair
The Galileo affair was a sequence of events, beginning around 1610, during which Galileo Galilei came into conflict with the Aristotelian scientific view of the universe , over his support of Copernican astronomy....
(1614–15).
The historical conflict thesis was a popular historiographical
Historiography
Historiography refers either to the study of the history and methodology of history as a discipline, or to a body of historical work on a specialized topic...
approach in the history of science
History of science
The history of science is the study of the historical development of human understandings of the natural world and the domains of the social sciences....
during the late 19th and early 20th centuries, but in its early form is mostly discarded. Despite that, the conflict thesis remains a popular view among the general public and has been recently publicized by the success of Richard Dawkins
Richard Dawkins
Clinton Richard Dawkins, FRS, FRSL , known as Richard Dawkins, is a British ethologist, evolutionary biologist and author...
' The God Delusion
The God Delusion
The God Delusion is a 2006 bestselling non-fiction book by British biologist Richard Dawkins, professorial fellow of New College, Oxford, and inaugural holder of the Charles Simonyi Chair for the Public Understanding of Science at the University of Oxford.In The God Delusion, Dawkins contends that...
and other popular books associated with the "New Atheist
New Atheism
New Atheism is the name given to a movement among some early-21st-century atheist writers who have advocated the view that "religion should not simply be tolerated but should be countered, criticized, and exposed by rational argument wherever its influence arises." New atheists argue that recent...
" movement.
The historical conflict thesis
The scientist John William DraperJohn William Draper
John William Draper was an American scientist, philosopher, physician, chemist, historian, and photographer. He is credited with producing the first clear photograph of a female face and the first detailed photograph of the Moon...
and the intellectual
Intellectual
An intellectual is a person who uses intelligence and critical or analytical reasoning in either a professional or a personal capacity.- Terminology and endeavours :"Intellectual" can denote four types of persons:...
Andrew Dickson White
Andrew Dickson White
Andrew Dickson White was a U.S. diplomat, historian, and educator, who was the co-founder of Cornell University.-Family and personal life:...
were the most influential exponents of the Conflict Thesis between religion and science. In the early 1870s, Draper was invited to write a History of the Conflict between Religion and Science (1874), a book replying to contemporary papal edicts such as the doctrine of infallibility
Papal infallibility
Papal infallibility is a dogma of the Catholic Church which states that, by action of the Holy Spirit, the Pope is preserved from even the possibility of error when in his official capacity he solemnly declares or promulgates to the universal Church a dogmatic teaching on faith or morals...
, and mostly criticising the anti-intellectualism
Anti-intellectualism
Anti-intellectualism is hostility towards and mistrust of intellect, intellectuals, and intellectual pursuits, usually expressed as the derision of education, philosophy, literature, art, and science, as impractical and contemptible...
of Roman Catholicism, yet he assessed that Islam
Islam
Islam . The most common are and . : Arabic pronunciation varies regionally. The first vowel ranges from ~~. The second vowel ranges from ~~~...
and Protestantism
Protestantism
Protestantism is one of the three major groupings within Christianity. It is a movement that began in Germany in the early 16th century as a reaction against medieval Roman Catholic doctrines and practices, especially in regards to salvation, justification, and ecclesiology.The doctrines of the...
had little conflict with science
Science
Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe...
. Draper’s preface summarises the conflict thesis:
In 1896, White published the History of the Warfare of Science with Theology in Christendom, the culmination of thirty years of research and publication on the subject, addressing the restrictive, dogmatic forms of Christianity
Christianity
Christianity is a monotheistic religion based on the life and teachings of Jesus as presented in canonical gospels and other New Testament writings...
. In the introduction, White emphasized he arrived at his position after the difficulties of assisting Ezra Cornell
Ezra Cornell
Ezra Cornell was an American businessman and education administrator. He was a founder of Western Union and a co-founder of Cornell University...
in establishing a university without any official religious affiliation. In The Popes and Science; the History of the Papal Relations to Science During the Middle Ages and Down to Our Own Time (1908), a book dedicated to Pope Pius X, the historian of medicine, James Joseph Walsh
James Joseph Walsh
James Joseph Walsh, M.D., LL.D., Litt.D., Sc.D. was an American physician and author, born in New York City. He graduated from Fordham College in 1884 and from the University of Pennsylvania in 1895...
, M.D., criticized White’s scientific perspective as anti-historical:
In God and Nature (1986), David Lindberg
David C. Lindberg
David C. Lindberg is an American historian of science. His main focus is in the history of medieval and early modern science, especially physical science and the relationship between religion and science. Lindberg is the author or editor of many books and received numerous grants and awards...
and Ronald Numbers
Ronald Numbers
Ronald L. Numbers is an American historian of science. He was awarded the 2008 George Sarton Medal by the History of Science Society for "a lifetime of exceptional scholarly achievement by a distinguished scholar".- Biography :...
report that "White's Warfare apparently did not sell as briskly as Draper's Conflict, but in the end it proved more influential, partly, it seems, because Draper's strident anti-Catholicism soon dated his work and because White's impressive documentation gave the appearance of sound scholarship". During the 20th century, historians’ acceptance of the Conflict Thesis declined until rejected in the 1970s, David B. Wilson notes:
Academic
Contemporarily, most of the scholarship supporting the Conflict Thesis is considered inaccurate. Biologist Stephen Jay GouldStephen Jay Gould
Stephen Jay Gould was an American paleontologist, evolutionary biologist, and historian of science. He was also one of the most influential and widely read writers of popular science of his generation....
said: "White’s and Draper’s accounts of the actual interaction between science and religion in Western history do not differ greatly. Both tell a tale of bright progress continually sparked by science. And both develop and utilize the same myths to support their narrative, the flat-earth legend
Myth of the Flat Earth
The myth of the Flat Earth is the modern misconception that the prevailing cosmological view during the Middle Ages saw the Earth as flat, instead of spherical....
prominently among them". In a summary of the historiography
Historiography
Historiography refers either to the study of the history and methodology of history as a discipline, or to a body of historical work on a specialized topic...
of the Conflict Thesis, Colin Russell
Colin A. Russell
Colin Archibald Russell is Emeritus Professor of History of Science and Technology at the Open University and is a research scholar affiliated to the History and Philosophy of Science Department, Cambridge University...
said that "Draper takes such liberty with history, perpetuating legends as fact that he is rightly avoided today in serious historical study. The same is nearly as true of White, though his prominent apparatus of prolific footnotes may create a misleading impression of meticulous scholarship”.
However Gould's stance of Non-overlapping magisteria
Non-overlapping magisteria
Non-overlapping magisteria is the view advocated by Stephen Jay Gould that "science and religion do not glower at each other... [but] interdigitate in patterns of complex fingering, and at every fractal scale of self-similarity." He suggests, with examples, that "NOMA enjoys strong and fully...
has been strongly criticized by Dawkins among others, who asks "If science cannot answer any ultimate question, what makes anybody think that religion can?"
Dawkins also challenges the Christian belief that human beings have been designed, when he points out that "all appearances to the contrary, the only watchmaker in nature is the blind forces of physics".
This line is also taken by Daniel Dennett
Daniel Dennett
Daniel Clement Dennett is an American philosopher, writer and cognitive scientist whose research centers on the philosophy of mind, philosophy of science and philosophy of biology, particularly as those fields relate to evolutionary biology and cognitive science. He is currently the Co-director of...
in his book Darwin's Dangerous Idea
Darwin's Dangerous Idea
Darwin's Dangerous Idea: Evolution and the Meanings of Life is a book by Daniel Dennett which argues that Darwinian processes are the central organizing force that gives rise to complexity...
.
In Science & Religion, Gary Ferngren proposes a more complex relationship, between religion and science, than that proposed by the Conflict Theory:
Some contemporary historians of science, such as Peter Barker, Bernard R. Goldstein
Bernard R. Goldstein
Bernard R. Goldstein is a historian of science and professor emeritus at the University of Pittsburgh. Goldstein published on the history of astronomy in medieval Islamic and Jewish civilization and early modern times.- Selected publications :...
, and Crosbie Smith propose that scientific discoveries, such as Kepler's laws of planetary motion
Kepler's laws of planetary motion
In astronomy, Kepler's laws give a description of the motion of planets around the Sun.Kepler's laws are:#The orbit of every planet is an ellipse with the Sun at one of the two foci....
in the 17th century, and the reformulation of physics in terms of energy
Energy
In physics, energy is an indirectly observed quantity. It is often understood as the ability a physical system has to do work on other physical systems...
, in the 19th century, were driven by religion. Religious organizations and clerics figure prominently in the broad histories of science, until the professionalization
Profession
A profession is a vocation founded upon specialized educational training, the purpose of which is to supply disinterested counsel and service to others, for a direct and definite compensation, wholly apart from expectation of other business gain....
of the scientific enterprise, in the 19th century, led to tensions between scholars taking religious and secular approaches to nature. Even the prominent examples of religion’s anti-intellectualism
Anti-intellectualism
Anti-intellectualism is hostility towards and mistrust of intellect, intellectuals, and intellectual pursuits, usually expressed as the derision of education, philosophy, literature, art, and science, as impractical and contemptible...
, the Galileo affair
Galileo affair
The Galileo affair was a sequence of events, beginning around 1610, during which Galileo Galilei came into conflict with the Aristotelian scientific view of the universe , over his support of Copernican astronomy....
(1614) and the Scopes trial
Scopes Trial
The Scopes Trial—formally known as The State of Tennessee v. John Thomas Scopes and informally known as the Scopes Monkey Trial—was a landmark American legal case in 1925 in which high school science teacher, John Scopes, was accused of violating Tennessee's Butler Act which made it unlawful to...
(1925), were not pure instances of conflict between science and religion, but included personal and political facts in the development of each conflict.
American biologist PZ Myers
PZ Myers
Paul Zachary "PZ" Myers is an American biology professor at the University of Minnesota Morris and the author of the Pharyngula science blog. He is currently an associate professor of biology at UMM, works with zebrafish in the field of evolutionary developmental biology , and also cultivates an...
actively criticizes supernaturalism, spirituality, intelligent design
Intelligent design
Intelligent design is the proposition that "certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as natural selection." It is a form of creationism and a contemporary adaptation of the traditional teleological argument for...
, creationism
Creationism
Creationism is the religious beliefthat humanity, life, the Earth, and the universe are the creation of a supernatural being, most often referring to the Abrahamic god. As science developed from the 18th century onwards, various views developed which aimed to reconcile science with the Genesis...
, and religion in general on his blog Pharyngula
Pharyngula (blog)
Pharyngula is a blog on FreeThoughtBlogs and ScienceBlogs run by PZ Myers. In 2006, the science journal Nature listed it as the top-ranked blog written by a scientist. Pharyngula also won the 2005 Koufax Award for Best Expert Blog. The blog topics are eclectic, delving into the non-scientific as...
. During the 2010 Global Atheist
Convention he stated:
Popular, scientific, and religious views
The historian of science Ronald NumbersRonald Numbers
Ronald L. Numbers is an American historian of science. He was awarded the 2008 George Sarton Medal by the History of Science Society for "a lifetime of exceptional scholarly achievement by a distinguished scholar".- Biography :...
relates that, unlike among science historians, the theory of a historical, intrinsic and inevitable anti-intellectual
Anti-intellectualism
Anti-intellectualism is hostility towards and mistrust of intellect, intellectuals, and intellectual pursuits, usually expressed as the derision of education, philosophy, literature, art, and science, as impractical and contemptible...
conflict between (Judeo-Christian) religion and science remains popular among the general public, some scientists, and some clerics, and is fanned by current issues like the creation–evolution controversy, stem cell controversy
Stem cell controversy
The stem cell controversy is the ethical debate primarily concerning the creation, treatment, and destruction of human embryos incident to research involving embryonic stem cells. Not all stem cell research involves the creation, use, or destruction of human embryos...
, and birth control
Birth control
Birth control is an umbrella term for several techniques and methods used to prevent fertilization or to interrupt pregnancy at various stages. Birth control techniques and methods include contraception , contragestion and abortion...
. Some scholars, such as Brian Stanley and Denis Alexander
Denis Alexander
Dr. Denis Alexander is the director of the Faraday Institute for Science and Religion at St Edmund's College, Cambridge, a molecular biologist and an author on science and religion. He is also an editor of Science and Christian Belief. He is an evangelical Christian.-Scientific work:Alexander was...
, propose that the media are among those responsible for perpetuating the Conflict Theory of hostile relations between religion and science, and the persistence in the popular public mind of "the warfare of science and religion" resulting in such things as medieval
Middle Ages
The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...
people believing that the Earth was flat
Flat Earth
The Flat Earth model is a belief that the Earth's shape is a plane or disk. Most ancient cultures have had conceptions of a flat Earth, including Greece until the classical period, the Bronze Age and Iron Age civilizations of the Near East until the Hellenistic period, India until the Gupta period ...
, was first propagated when the conflict thesis originated. David C. Lindberg
David C. Lindberg
David C. Lindberg is an American historian of science. His main focus is in the history of medieval and early modern science, especially physical science and the relationship between religion and science. Lindberg is the author or editor of many books and received numerous grants and awards...
and Numbers point out that “there was scarcely a Christian scholar of the Middle Ages who did not acknowledge Earth's
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
sphericity and even know its approximate circumference". Statements like "the Church prohibited autopsies and dissections during the Middle Ages", "the rise of Christianity killed off ancient science", and "the medieval Christian church suppressed the growth of the natural sciences", are cited by Numbers as other examples of widely popular myths that still pass as historical truth, even though they are not supported by current historical research.
See also
- AntireligionAntireligionAntireligion is opposition to religion. Antireligion is distinct from atheism and antitheism , although antireligionists may be atheists or antitheists...
- AntitheismAntitheismAntitheism is active opposition to theism. The etymological roots of the word are the Greek 'anti-' and 'theismos'...
- ApologeticsApologeticsApologetics is the discipline of defending a position through the systematic use of reason. Early Christian writers Apologetics (from Greek ἀπολογία, "speaking in defense") is the discipline of defending a position (often religious) through the systematic use of reason. Early Christian writers...
- Boundary-workBoundary-workIn science studies, boundary-work comprises instances in which boundaries, demarcations, or other divisions between fields of knowledge are created, advocated, attacked, or reinforced...
- Continuity thesisContinuity thesisIn the history of ideas, the continuity thesis is the hypothesis that there was no radical discontinuity between the intellectual development of the Middle Ages and the developments in the Renaissance and early modern period. Thus the idea of an intellectual or scientific revolution following the...
- EmpiricismEmpiricismEmpiricism is a theory of knowledge that asserts that knowledge comes only or primarily via sensory experience. One of several views of epistemology, the study of human knowledge, along with rationalism, idealism and historicism, empiricism emphasizes the role of experience and evidence,...
- Epistemology
- Faith and rationalityFaith and rationalityFaith and rationality are two modes of belief that exist in varying degrees of conflict or compatibility. Rationality is belief based on reason or evidence. Faith is belief in inspiration, revelation, or authority...
- FideismFideismFideism is an epistemological theory which maintains that faith is independent of reason, or that reason and faith are hostile to each other and faith is superior at arriving at particular truths...
- Flat earthFlat EarthThe Flat Earth model is a belief that the Earth's shape is a plane or disk. Most ancient cultures have had conceptions of a flat Earth, including Greece until the classical period, the Bronze Age and Iron Age civilizations of the Near East until the Hellenistic period, India until the Gupta period ...
- Genesis creation myth
- Reformed epistemologyReformed epistemologyIn the philosophy of religion, reformed epistemology is a school of thought regarding the epistemology of belief in God put forward by a group of Protestant Christian philosophers, most notably, Alvin Plantinga, William Alston, Nicholas Wolterstorff and Michael C. Rea...
- Religious intoleranceReligious intoleranceReligious intolerance is intolerance against another's religious beliefs or practices.-Definition:The mere statement on the part of a religion that its own beliefs and practices are correct and any contrary beliefs incorrect does not in itself constitute intolerance...
- Religious tolerationReligious tolerationToleration is "the practice of deliberately allowing or permitting a thing of which one disapproves. One can meaningfully speak of tolerating, ie of allowing or permitting, only if one is in a position to disallow”. It has also been defined as "to bear or endure" or "to nourish, sustain or preserve"...
- Scientific imperialismScientific imperialismScientific imperialism is a term that appears to have been coined by Dr. Ellis T. Powell when addressing the Commonwealth Club of Canada on 8 September 1920...
- Scientific methodScientific methodScientific method refers to a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry must be based on gathering empirical and measurable evidence subject to specific principles of...
- Scientific mythology
- ScientismScientismScientism refers to a belief in the universal applicability of the systematic methods and approach of science, especially the view that empirical science constitutes the most authoritative worldview or most valuable part of human learning to the exclusion of other viewpoints...
External links
- A Reappraisal of the Encounter between Christianity and Science
- The Mythical Conflict between Science and Religion by James Hannam
Further reading
- Barbour, Ian G. When Science Meets Religion. HarperSanFrancisco, 2000.
- Brooke, John H., Margaret OslerMargaret J. OslerMargaret J. Osler was a historian and philosopher of early modern science and a Professor of History at the University of Calgary. She received a B.A. in Philosophy from Swarthmore College in 1963, and M.A. and Ph.D. degrees from Indiana University in History and Philosophy of Science under the...
, and Jitse M. van der Meer, (editors). "Science in Theistic Contexts: Cognitive Dimensions," Osiris, 2nd ser., vol. 16(2001), ISBN 0-226-07565-6. - Ferngren, Gary (editor). Science & Religion: A Historical Introduction. Baltimore: Johns Hopkins University Press, 2002. ISBN 0-8018-7038-0
- Lindberg, David C. and Ronald L. Numbers, eds., God & Nature: Historical Essays on the Encounter Between Christianity and Science. University of California Press, 1986.
- Lindberg and Numbers, "Beyond War and Peace: A Reappraisal of the Encounter between Christianity and Science," Perspectives on Science and Christian Faith 39 (1987):140-49. (Can be found online here
- Merton, Robert K. Science, Technology, and Society in Seventeenth Century England. Osiris 4(1938): 360-632. Reprinted New York: Harper & Row, 1970. (Advances the thesis that Puritanism contributed to the rise of science.)
- Westfall, Richard S. Science and Religion in Seventeenth-Century England. New Haven: Yale Univ. Pr. 1958. Reprinted Ann Arbor: Univ. of Michigan Pr., 1973. ISBN 0-472-06190-9