INDEX 



iii. 131; made the only con- 

 spicuous attempt to classify 

 the strata, iii. 155. 



Wilkinson, assisted in clearing 

 up the mysteries of the in- 

 scriptions on the Rosetta 

 Stone, i. 27. 



Willis, Thomas, English phy- 

 sician, ii. 187. 



Winds, controlled by a general 

 mathematical law, iii. 200; 

 their direction in a storm 

 centre, iii, 201, 202; long time 

 forecasts possible only in India, 

 iii. 205. 



Winkler, Johann Heinrichs, tries 

 to measure speed of electric 

 current, ii. 278. 



Wiseman, Richard, English sur- 

 geon, ii. 184. 



Wohler, Friedrich, synthesized 

 the organic product urea, iv. 

 54; isomerism proved by, iv. 

 62 ; school of physiological 

 chemistry under guidance of, 

 iv. 128. 



Wollaston, Dr. William Hyde, 

 his suggestions to improve the 

 microscope, iv. no. 



Wortman, Dr. J. L., his evidence 

 in connection with the fossil 

 lineage of the edentates, iii. 

 114. 



Wundt, Dr. Wilhelm, studies of 

 sensations, apperception, and 

 volition, iv. 267. 



XENOPHANES, founder of the 

 famous Eleatic School, i. 114, 

 127; his theories concerning 

 the creation, i. 128; the earliest 

 paleontologist, i. 129. 



Xiphilinus, his account of the 



battle between the Romans 

 and the hostile Quadi, i. 297. 

 X-ray, discovered in 1895, v. 97. 



YERSIN, famous for his re- 

 searches in the prevention and 

 cure of cholera, v. 184. 



Young, Dr. Thomas, and the 

 wave theory of light, iii. 215- 

 225; his extraordinary pre- 

 cocity, iii. 216; his "theory of 

 light and colors," iii. 217; 

 his experiments with microm- 

 eters, iii. 222; his doctrine 

 of the interference of un- 

 dulations, iii. 223; his wave 

 theory endorsed by Fresnel and 

 Aragp.iii. 226; determined op- 

 position to his wave theory by 

 French scientists, ibid.; final 

 acceptance of his wave theory 

 by the French academy, iii. 

 227; his theories about ether, 

 iii. 285; decipherment of the 

 Rosetta Stone, iv. 290; pro- 

 fessor of natural history in 

 Royal Institution, v. 35; wave 

 theory of light, v. 36. 



ZENON, discovery of, v. 87. 



Zero, absolute, approach to the, 

 v. 69; probable form of all 

 matter at, v. 70. 



Zoological classifications, v. 168. 



Zoology at the close of the 

 eighteenth century, iv. 99- 

 101. 



Zoology, the new, Ernst Haeckel 

 and, v. 144; import of the 

 study of, v. 166; fundamental 

 conception of, v. 167; Haeckel 

 the recognized leader in, v. 

 171. 



END OF VOL. V 



