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$1.10 in Canada EDIEVAL AND EARLY MODERN SCIENCE VOLUME l Science in the Middle Acres: V-XI1I Centuries . C. CROMBIE REVISED SECOMD EDITION MEDIEVAL AND EARLY MODERN SCIENCE Volume I floBM ? Q HMfi '5 2£&e> £JUlu f*\ dTb) ( fotJULy r* Alistair Cameron Crombie was bora in Brisbane, Australia, in 1915 and graduated in natural science from the Universities of Melbourne and Cambridge. He taught and carried out research in biology at Cambridge until 1946, when he went to the Univer- sity of London to teach the history and philosophy of science. In 1953 ne was appointed to his present post as Senior Lecturer in the History of Science in the University of Oxford. He has also served as Visiting Professor of Philosophy at the University of Washing- ton and ha* lectured at a number of other universities in Europe and America, in addition to broadcasting on the Third Programme of the BBC. He was the original editor of The British Journal for the Philosophy of Science. He is the author of a number of scientific and historical papers and of two books, Augustine to Gali- leo: the History of Science A.D. 400-1650 (1952, 1954, 1957) and Robert Grosseteste and the Origins of Experimental Science 1100-1700 (1953). MEDIEVAL AND EARLY MODERN SCIENCE Volume I Science in the Middle Ages: V-XIII Centuries A. C. CROMBIE DOUBLEDAY ANCHOR BOOKS DOUBLEDAY & COMPANY, INC. GARDEN CITY, NEW YORK 1959 The illustrations on the cover, showing geese in flight, are taken from De Arte Venandi cum Avibus (The Art of Falconry), Emperor Frederick II, Vatican MS Palatino Latino 1071 (xiii century). Cover design and typography by Edward Gorey. Medieval and Early Modern Science, Vol- ume I: Science in the Middle Ages is a revision of the first four chapters of Augustine to Galileo: the history of science a.d. 400- 1650 (London, 1952) by A. C. Crombie. Vol- ume II: Science in the Later Middle Ages and Early Modern Times, is a revision of Chapters V and VI. First published under the title Augustine to Galileo: the History of Science A.D. 400-1650 by the Falcon Press (London) Limited. Pub- lished 1953 by Harvard University Press. Re- vised edition, 1959. Library of Congress Catalog Card Number 59-6472 Copyright © 1959 by A. C. Crombie All Rights Reserved Printed in the United States of America TO NANCY ACKNOWLEDGEMENTS (VOL. i) Acknowledgements are made to the following for supplying photographs for illustrations: the Chief Librarian of the Oeffentliche Bibliothek, University of Basel (Plates VII, VIII, IX); the Librarian of Cambridge University (Figs. 12, 14 and Plates I, III, XXX, XXXI, XXXV, XXXVI); the Director of the Universitatsbibliothek, Erlangen (Plate X); the Director of the British Museum, London (Fig. 4 and Plates VI, XII, XIV, XXI, XXII, XXIV, XXVI, XXVII, XXVIII, XXXIII, XXXVIII, XXXIX); the Direc- tor of the Science Museum, London (Plate XXXVII: Crown Copyright); the Director of the Wellcome Museum of Medical History, London (Plate XX); Bodley's Librar- ian, Oxford (Plates II, V, XI, XVI, XXXII, XXXIV); the Librarian of Christ Church, Oxford (Plate XXIX); the Curator of the Museum of the History of Science, Oxford (Plate IV); the Scriptor of the Vatican Library, Rome (Plate XIII, XVIII, cover design); the Director of the Biblioteca Nazionale di S. Marco, Venice (Plate XVII); the Director of the Oesterreichische National Bibliothek, Vienna (Plate XV). The following lent blocks for illustra- tions: Messrs. William Heinemann, Ltd. (Fig. 11); Ox- ford University Press (Fig. 4 and Plates XXIII, XXVI); Penguin Books Ltd. (Fig. 10). I should like to thank Mr. Stillman Drake and Dr. Michael Hoskin for reading the proofs and suggesting a number of valuable improvements. PREFACE TO THE SECOND EDITION One of the most remarkable developments in the world of scholarly letteTs in the last generation, and especially since the end of the Second World War, has been the growth of the study of the history of science both as a professional historical discipline and among the interests of the general reader. Considering how science has quietly come to take a central position in our culture this is perhaps not sur- prising; some knowledge of the history of science has be- come unavoidably part of the acquisition of historical awareness. Certainly the considerable interest shown in the period covered by this book is not difficult to explain. It has long been a matter of curiosity to know something of the scientific thought of those medieval centuries in which so many other essential aspects of our civilisation, ranging from the theory and practice of law and government to the character of feeling and execution in poetry and the plastic arts, had their genesis and formation. I hope that in these pages the reader curious to know something of the history of medieval science, not simply as the background to modern science but as interesting in itself, may find at least a general guide to his inquiries. The stories of science in antiquity and in modern times have been told more than once in recent works, both separately and as part of general histories of science, but there exists no adequate short history of science in this formative period that lies between. My purpose in writing this book has been to fill this gap. The scholarship of the last half-century has long since banished the time when the rumours about medieval Xll PREFACE TO THE SECOND EDITION science, put about after the revival of interest in classical literature in the 15th century, could be regarded as an adequate substitute for the study of contemporary sources. In the pages that follow I have tried to use the results of recent research to tell, within the covers of a single gen- eral history, the story of Western science from its decay after the collapse of the Roman Empire in the West to its full reflowering in the 17th century. Especially I have tried to bring out, what I believe to be the most striking result of recent scholarship, the essential continuity of the Western scientific tradition from Greek times to the 17th century and, therefore, to our own day. Certainly the scien- tific thought of the period from Augustine to Galileo can often be deceptive both in its similarities to, and in its differences from modern science, but this is the inevitable result of its position as part of the great adventure of philosophical reformation undertaken by the barbarian in- vaders as they painfully educated themselves from the clas- sical sources. If I have seemed to give too little attention to the originality of Arabic science in this period, that is not because I underrate the indispensable contribution made by medieval Arabic civilisation in developing ancient science as well as in transmitting it to the West, but be- cause it is specifically the history of science in the Latin civilisation of the West that is the subject of this study. A broader treatment, perhaps too broad for a short work, would also include a full account of the history of science in both Islam and Byzantium. My debt to those great pioneers whose documentary researches first let the light into medieval science in this century, Paul Tannery, Pierre Duhem, Charles Homer Haskins, Karl Sudhoff, to the bibliographical industry of George Sarton, and to the critical work of more recent scholars, especially of Lynn Thorndike, Alexandre Koyr6 and Anneliese Maier, will be obvious to anyone who turns these pages and indeed must be incurred by any student who enters this field. Since the war many specialised studies over the whole field have appeared and continue to do so PREFACE TO THE SECOND EDITION Xlll in ever increasing numbers. I have tried to incorporate into this revision the relevant substance of those published since the first edition was completed, together with various changes in my own point of view. A.C.C. Oxford, 6 January 1958 CONTENTS LIST OF PLATES xix INTRODUCTION 1 I SCIENCE IN WESTERN CHRISTENDOM UNTIL THE TWELFTH-CENTURY REN- AISSANCE 9 Adelard of Bath (9-10). The Latin encyclopae- dists: Pliny, Boethius, Cassiodorus, Isidore of Se- ville (11-13). Early Christian philosophy of na- ture: Neoplatonism, symbolism, astrology; Au- gustine of Hippo (13-18). Practical empiricism: Cassiodorus; Bede's cosmology, calendar; Anglo- Saxon medicine, computus (18-25). Nominal- ism; Abelard (25). Adelard of Bath; physics at Chartres; the Tinueus (25-32). II THE RECEPTION OF GRECO-ARABIC SCIENCE IN WESTERN CHRISTENDOM 33 The transmission of science from the Greeks to the Arabs and to the Latin West (33-49); Hindu mathematics (49-52). Power over na- ture through magic and science; Roger Bacon (52-56). Greek natural philosophy and Chris- tianity: Aristotelianism, Averroes, Augustine, 13th-century schools (56-64). HI THE SYSTEM OF SCIENTIFIC THOUGHT IN THE THIRTEENTH CENTURY 65 (l) EXPLANATION OF CHANGE AND CONCEPTION OF SUBSTANCE 65 . XVI CONTENTS Summary of treatment (65-66). Conception of substance; Plato and Aristotle; physics, mathe- matics, metaphysics (66-69). Aristotle's expla- nation of change, 'nature/ four causes (69-72). Four kinds of change; neoplatonic conceptions of 'first matter'; classifications of science, mathe- matics and physics (72-75). (2) COSMOLOGY AND ASTRONOMY 75 Aristotle's cosmology; natural place and natural motion (75-78). Aristotelian and Ptolemaic astronomy (78-86). Latin astronomical theory (86-89). Practical astronomy, instruments, trig- onometry (89-98). (3) METEOROLOGY AND OPTICS 98 Aristotle's sublunary region; William Merlee (98-99). Greek and Arabic optics, Alhazen (99- 102). Grosseteste (99-100, 102-4). Roger Ba- con (104-6). Witelo, Summa Philosophise, Pecham (106-10). Theodoric of Freiberg, expla- nation of the rainbow (110-13).