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st honors。 Meanwhile he kept steadily at work in his study of natural history; acquiring considerable knowledge of ornithology; entomology; and botany; and adding continually to his collection of botanical specimens。 In 1729 his botanical knowledge was brought to the attention of Olaf Rudbeck; professor of botany in the University of Upsala; by a short paper on the sexes of plants which Linnaeus had prepared。 Rudbeck was so impressed by some of the ideas expressed in this paper that he appointed the author as his assistant the following year。 This was the beginning of Linnaes's career as a botanist。 The academic gardens were thus thrown open to him; and he found time at his disposal for pursuing his studies between lecture hours and in the evenings。 It was at this time that he began the preparation of his work the Systema naturae; the first of his great works; containing a comprehensive sketch of the whole field of natural history。 When this work was published; the clearness of the views expressed and the systematic arrangement of the various classifications excited great astonishment and admiration; and placed Linaeus at once in the foremost rank of naturalists。 This work was followed shortly by other publications; mostly on botanical subjects; in which; among other things; he worked out in detail his famous 〃system。〃 This system is founded on the sexes of plants; and is usually referred to as an 〃artificial method〃 of classification because it takes into account only a few marked characters of plants; without uniting them by more general natural affinities。 At the present time it is considered only as a stepping…stone to the 〃natural〃 system; but at the time of its promulgation it was epoch…marking in its directness and simplicity; and therefore superiority; over any existing systems。 One of the great reforms effected by Linnaeus was in the matter of scientific terminology。 Technical terms are absolutely necessary to scientific progress; and particularly so in botany; where obscurity; ambiguity; or prolixity in descriptions are fatally misleading。 Linnaeus's work contains something like a thousand terms; whose meanings and uses are carefully explained。 Such an array seems at first glance arbitrary and unnecessary; but the fact that it has remained in use for something like two centuries is indisputable evidence of its practicality。 The descriptive language of botany; as employed by Linnaeus; still stands as a model for all other subjects。 Closely allied to botanical terminology is the subject of botanical nomenclature。 The old method of using a number of Latin words to describe each different plant is obviously too cumbersome; and several attempts had been made prior to the time of Linnaeus to substitute simpler methods。 Linnaeus himself made several unsatisfactory attempts before he finally hit upon his system of 〃trivial names;〃 which was developed in his Species plantarum; and which; with some; minor alterations; remains in use to this day。 The essence of the system is the introduction of binomial nomenclaturethat is to say; the use of two names and no more to designate any single species of animal or plant。 The principle is quite the same as that according to which in modern society a man has two names; let us say; John Doe; the one designating his family; the other being individual。 Similarly each species of animal or plant; according to the Linnaeean system; received a specific or 〃trivial〃 name; while various species; associated according to their seeming natural affinities into groups called genera; were given the same generic name。 Thus the generic name given all members of the cat tribe being Felis; the name Felis leo designates the lion; Felis pardus; the leopard; Felis domestica; the house cat; and so on。 This seems perfectly simple and natural now; but to understand how great a reform the binomial nomenclature introduced we have but to consult the work of Linnaeus's predecessors。 A single illustration will suffice。 There is; for example; a kind of grass; in referring to which the naturalist anterior to Linnaeus; if he would be absolutely unambiguous; was obliged to use the following descriptive formula: Gramen Xerampelino; Miliacea; praetenuis ramosaque sparsa panicula; sive Xerampelino congener; arvense; aestivum; gramen minutissimo semine。 Linnaeus gave to this plant the name Poa bulbosaa name that sufficed; according to the new system; to distinguish this from every other species of vegetable。 It does not require any special knowledge to appreciate the advantage of such a simplification。 While visiting Paris in 1738 Linnaeus met and botanized with the two botanists whose 〃natural method〃 of classification was later to supplant his own 〃artificial system。〃 These were Bernard and Antoine Laurent de Jussieu。 The efforts of these two scientists were directed towards obtaining a system which should aim at clearness; simplicity; and precision; and at the same time be governed by the natural affinities of plants。 The natural system; as finally propounded by them; is based on the number of cotyledons; the structure of the seed; and the insertion of the stamens。 Succeeding writers on botany have made various modifications of this system; but nevertheless it stands as the foundation…stone of modern botanical classification。

APPENDIX REFERENCE LIST CHAPTER I SCIENCE IN THE DARK AGE '1' (p。 4)。 James Harvey Robinson; An Introduction to the History of Western Europe; New York; 1898; p。 330。 '2' (p。 6)。 Henry Smith Williams; A Prefatory Characterization of The History of Italy; in vol。 IX。 of The Historians' History of the World; 25 vols。; London and New York; 1904。

CHAPTER III MEDIAeVAL SCIENCE IN THE WEST '1' (p。 47)。 Etigene Muntz; Leonardo do Vinci; Artist; Thinker; and Man of Science; 2 vols。; New York; 1892。 Vol。 II。; p。 73。

CHAPTER IV THE NEW COSMOLOGYCOPERNICUS TO KEPLER AND GALILEO '1' (p。 62)。 Copernicus; uber die Kreisbewegungen der Welfkorper; trans。 from Dannemann's Geschichle du Naturwissenschaften; 2 vols。; Leipzig; 1896。 '2' (p。 90)。 Galileo; Dialogo dei due Massimi Systemi del Mondo; trans。 from Dannemann; op。 cit。 CHAPTER V GALILEO AND THE NEW PHYSICS '1' (p。 101)。 Rothmann; History of Astronomy (in the Library of Useful Knowledge); London; 1834。 '2' (p。 102)。 William Whewell; History of the Inductive Sciences; 3 Vols; London; 1847…Vol。 II。; p。 48。 '3' (p。 111)。 The Lives of Eminent Persons; by Biot; Jardine; Bethune; etc。; London; 1833。 '4' (p。 113)。 William Gilbert; De Magnete; translated by P。 Fleury Motteley; London; 1893。 In the biographical memoir; p。 xvi。 '5' (p。 114)。 Gilbert; op。 cit。; p。 x1vii。 '6' (p。 114)。 Gilbert; op。 cit。; p。 24。

CHAPTER VI TWO PSEUDO…SCIENCESALCHEMY AND ASTROLOGY '1' (p。 125)。 Exodus xxxii; 20。 '2' (p。 126)。 Charles Mackay; Popular Delusions; 3 vols。; London; 1850。 Vol。 II。; p。 280。 '3' (p。 140)。 Mackay; op。 cit。; Vol。 11。; p。 289。 '4' (P。 145)。 John B。 Schmalz; Astrology Vindicated; New York; 1898。 '5' (p。 146)。 William Lilly; The Starry Messenger; London; 1645; p。 63。 '6' (p。 149)。 Lilly; op。 cit。; p。 70。 '7' (p。 152)。 George Wharton; An Astrological jugement upon His Majesty's Present March begun from Oxford; May 7; 1645; pp。 7…10。 '8' (p。 154)。 C。 W。 Roback; The Mysteries of Astrology; Boston; 1854; p。 29。

CHAPTER VII FROM PARACELSUS TO HARVEY '1' (p。 159)。 A。 E。 Waite; The Hermetic and Alchemical Writings of Paracelsus; 2 vols。; London; 1894。 Vol。 I。; p。 21。 '2' (p。 167)。 E。 T。 Withington; Medical History from the Earliest Times; London; 1894; p。 278。 '3' (p。 173)。 John Dalton; Doctrines of the Circulation; Philadelphia; 1884; p。 179。 '4' (p。 174)。 William Harvey; De Motu Cordis et Sanguinis; London; 1803; chap。 X。 '5' (p。 178)。 The Works of William Harvey; translated by Robert Willis; London; 1847; p。 56。

CHAPTER VIII MEDICINE IN THE SIXTEENTH AND SEVENTEENTH CENTURIES '1' (p。 189)。 Hermann Baas; History of Medicine; translated by H。 E。 Henderson; New York; 1894; p。 504。 '2' (p。 189)。 E。 T。 Withington; Medical History from the Earliest Times; London; 1894; p。 320。

CHAPTER IX PHILOSOPHER…SCIENTISTS AND NEW INSTITUTIONS OF LEARNING '1' (p。 193)。 George L。 Craik; Bacon and His Writings and Philosophy; 2 vols。; London; 1846。 Vol。 II。; p。 121。 '2' (p。 193)。 From Huxley's address On Descartes's Discourse Touching the Method of Using One's Reason Rightly and of Seeking Scientific Truth。 '3' (p。 195)。 Rene Descartes; Traite de l'Homme (Cousins's edition。 in ii vols。); Paris; 1824。 Vol; VI。; p。 347。

CHAPTER X THE SUCCESSORS OF GALILEO IN PHYSICAL SCIENCE '1' (p。 205)。 See The Phlogiston Theory; Vol; IV。 '2' (p。 205)。 Robert Boyle; Philosophical Works; 3 vols。; London; 1738。 Vol。 III。; p。 41。 '3' (p。 206)。 Ibid。; Vol。 III。; p。 47。 '4' (p。 206)。 Ibid。; Vol。 II。; p。 92。 '5' (p。 207)。 Ibid。; Vol。 II。; p。 2。 '6' (p。 209)。 Ibid。; Vol。 I。; p。 8。 '7' (p。 209)。 Ibid。; vol。 III。; p。 508。 '8' (p。 210)。 Ibid。; Vol。 III。) p。 361。 '9' (p。 213)。 Otto von Guericke; in the Philosophical Transactions of the Royal Society of London; No。 88; for 1672; p。 5103。 '10' (p。 222)。 Von Guericke; Phil。 Trans。 for 1669; Vol I。; pp。 173; 174。 CHAPTER XI NEWTON AND THE COMPOSITION OF LIGHT '1' (p。 233)。 Phil。 Trans。 of Royal Soc。 of London; No。 80; 1672; pp。 3076…3079。 '2' (p 234)。 Ibid。; pp。 30

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