A HISTORY OF SCIENCE 



Printing-press, its part in the 

 development of medical learn- 

 ing, ii. 39. 



Problems, in ventilation, v. 201; 

 some unsolved scientific, v. 

 203-229; solar and telluric, v. 

 205-213; physical, v. 213-220; 

 life, v. 220-229; of anthropol- 

 ogy, v. 228. 



Protoplasm, studies in, by De 

 Bary and Schultze, iv. 125. 



Proust, Louis Joseph, disputes 

 Dal ton's atomic theory, iv. 41. 



Prout, Dr. William, studies of 

 atomic weights, iv. 66; his 

 alleged law revived by Du- 

 mas, iv. 67; detected hydro- 

 chloric acid in gastric juice, iv. 

 129. 



Ptolemy, erected a museum and 

 collected a library which made 

 Alexandria the culture-centre 

 of the world, i. 190; the last 

 great astronomer of antiquity, 

 i. 267; discovered the moon's 

 evection, i. 268; his writings 

 became the sole astronomical 

 text-book of the Middle Ages, 

 i. 269; his theory of epicycles, 

 i. 270; the errors in the 

 colored maps attributed to 

 him led to the discovery of 

 America, i. 271. 



Purkinje discovers that the pan- 

 creas shares in digestion, iv. 

 129. 



Pyramids, the building of, i. 32; 

 oriented in strict accordance 

 with some astronomical prin- 

 ciple, i. 33. 



Pythagoras, a youthful athlete, 

 i. 112; one of the fathers of 

 Grecian thought, i. 114; the 

 founder of an independent 

 school of philosophy, i. 116; 

 advocates the theory of the 

 sphericity of the earth, i. 118, 

 119; the discoverer of the 

 identity of Hesperus and Luci- 

 fer, i. 120; carried the science 

 of geometry to perfection, 

 ibid.; no written line of his 



has come to us, i. 121; a 

 summary of his doctrines as 

 quoted by Diogenes, i. 122; an 

 agnostic as regards the current 

 Greek religion, i. 127. 



QUESTION as to living forms on 



other worlds, v. 220. 

 Quinine, its introduction, ii. 185. 



RABIES, or hydrophobia, slow in 

 development, v. 182. 



Radio-active bodies, nature of 

 emanations from, v. 102; dif- 

 ferent kinds of rays produced 

 by, v. 103 ; source of energy of, 

 v. 106. 



"Radio-activity," v. 97-102; so 

 termed by Madame Curie, v. 

 101; source of energy of, v. 

 1 06; and the structure of the 

 atom, v. 107. 



Radiolarians, the discovery of 

 numerous species by Ernst 

 Haeckel, v. 154; part played 

 in evolution, v. 155. 



Radium, discovered by Pierre 

 Curie and his wife, v. 100; 

 power of, in penetrating sub- 

 stances, v. 101, 102; an ele- 

 mentary substance, v. 104; 

 Ramsay's experiments with, 

 ibid.; presence of helium in, 

 v. 105; methods devised for 

 testing heat given off by, v. 

 no; its heat-giving qualities, 

 v. 211. 



Ramsay, Sir William, and new 

 gases, v. 82-92; laboratory 

 and equipment of, v. 83. 



Rawlinson, Canon, his estimate 

 of Babylonian influence, i. 82; 

 contrasted with that of Dio- 

 dorus, i. 83. 



Rawlinson, Sir Henry, "father of 

 Assyriology," iv. 229; v. 9. 



Rayleigh, Lord, of the Royal 

 Institution, experiments with 

 gases, v. 85, 86. 



Re, Filipo, his theories of radio- 

 activity, v. i 06. 



Reaumur, Rene, the stomach as 



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