A HISTORY OF SCIENCE 



UNIVERSITIES in the thirteenth 

 century, ii. 43. 



University College, London, Dr. 

 Ramsay's labors in, v. 82. 



University of Jena, v. 148-150; 

 freedom of thought and ex- 

 pression at, v. 158. 



Uranium, discovery of the radio- 

 active properties of, v. 100. 



VALVES of the veins, con- 

 troversy about them in the 

 sixteenth century, ii. 166. 



Van Beneden, discovery of the 

 centrosome, v. 226. 



Van Helmont, Jan Baptista, 

 founder of medical system, ii. 

 185. 



Van 't Hoof's studies of the 

 space relations of atoms, v. 219. 



Vegetables, leaves of, respiratory 

 organs, iv. 94; cell walls of, iv. 

 124. 



Ventilation, problems in, v. 200, 

 201. 



Venus, phases of the planet 

 discovered by Galileo, ii. 79. 



Vesalius, Andrew, "the greatest 

 of anatomists," ii. 164. 



Virchow, Rudolf, demonstrates 

 the correctness of Von Mohl's 

 cell formation, iv. 127; the 

 discoveries of, v. 188; his work 

 in pathology, v. 189; his ways 

 of living and working, v. 190; 

 his method of teaching, v. 

 191, 192. 



Vitalists system, iv. 185; theory 

 of, iv. 1 86. 



Vitrous oxide in painless dentis- 

 try, iv. 213. 



Volta, Alessandro, inventor of the 

 "voltaic pile," now known as 

 the galvanic current, iii. 230, 

 232. 



Von Baer, Karl Ernst, studies in 

 embryology, iv. 122. 



Von Guericke, Otto, inventor of 

 air-pump, ii. 211; demon- 

 stration of atmospheric press- 

 ure, ii. 212; electrical dis- 

 coveries, ii. 213. 



Von Kleist, Dean, discovers 

 principle of the Leyden jar, 

 ii. 280. 



Von Mohl, Dr. Hugo, studies of 

 the vegetable cell, iv. 123; dis- 

 covery of the formation of 

 cells, iv. 126; correctness of 

 cell theory demonstrated by 

 Virchow, iv. 127. 



Vortex atom, speculations based 

 upon the hypothesis of, v. 216. 



Vortex theory, Lord Kelvin's 

 estimate of, v. 217. 



WALLACE, ALFRED RUSSEL, the 

 work of, iv. 172 ; joint paper of, 

 and Darwin presented to the 

 Linnasan Society of London, 

 iv. 173. 



Waller and the study of "trop- 

 ical centres," iv. 280. 



"Warren mastodon," iii. 113. 



Wars, their stimulating effect 

 upon surgery in the thirteenth 

 century, ii. 39. 



' ' Water controversy ' ' between 

 Cavendish and Watt, iv. 14, 



J 5- 



Watson, William, electrical ex- 

 periments, ii. 284. 



Watt, James, controversy with 

 Cavendish, iv. 14; Arago de- 

 cides in favor of, iv. 15; his 

 process of practical bleaching, 

 iv. 26. 



Weber, E. H., experiments on 

 nerve stimuli, iv. 264. 



Wedgwood, Josiah, gauged the 

 highest temperature with the 

 clay pyrometer, iii. 206. 



Weismann, August, objections 

 to the Lamarckian conception, 

 iv. 178; theory of heredity, v. 

 134; scheme of the relations 

 of the intracellular units, v. 

 226. 



Wells, Dr. W. C., solved the 

 problem of dew formation, iii. 

 183; his essay on dew, iii. 185. 



Wells, Dr. Horace, experiments 

 in painless dentistry, iv. 213. 



Werner, a scientist of Saxony, 



300 



