KEY AND INDEX 



Development of Modern Ge- 

 ology, The Origin and, 

 Chapter IV, 3, 116. 



Development of Electricity and 

 Magnetism, The Modern, 

 Chapter VII, 3, 229. 



Development of Electric Rail- 

 ways, The, Chapter VI, 7, 1 75. 



Deville, Ste.-Claire, dissolution 

 and reformation of molecules 

 fully appreciated by, 4, 61. 



De Vinne, Theodore L., his 

 description of a perfected 

 magazine press, 8, 135. 



Dewar, Professor James, ex- 

 periments with low tempera- 

 tures, 5, 39; liquefied "hy- 

 drogen," 6, 43; his vacuum 

 vessel for holding liquefied 

 gases, 6, 53, 54, 68; his ex- 

 periments show that carbon 

 will liquefy under pressure 

 of about fifteen tons to the 

 square inch, 9, 327. 



Diamond Drill, 6, 247. 



Dias, Bartholomeo, discovered 

 the Cape of Good Hope, 7, 46. 



Diesbach, accidentally discov- 

 ered a blue pigment, 8, 299. 



Digestion, chemical theory of, 

 4, 88-91; function of the 

 glands that act in the process 

 of, 4, 129, 130. 



Diodorus, the Sicilian, 1, 56; 

 left us a striking summary 

 of Babylonian science, 1, 

 77; describes pyramid-build- 

 ing in Egypt, 6, 37. 



Diogenes Laertius, his story of 

 the athletic prowess of Pythag- 

 oras, 1, 112. 



Diphtheria, discovery of anti- 

 toxine for, 4, 242. 



Disputed question of "spon- 

 taneous" variations, 4, 178; 

 Haeckel and Spencer and the, 

 ibid. 



"Dissociation," the dissolution 

 and reformation of molecules 

 in a substance, 4, 61. 



Doctrine of irritability, Haller's 

 greatest contribution to medi- 

 cal science, 4, 74. 



Dog, first animal to be domes- 



ticated, still used as beast of 

 burden, 6, 59. 



Dohrn, Dr. Anton, founder of 

 the Marine Biological Labora- 

 tory at Naples, 5, 121 ; theory 

 of the annelid type of inver- 

 tebrate ancestor of the ver- 

 tebrates, 5, 137. 



Domestic economy, methods at 

 beginning nineteenth century 

 compared with those at end, 

 6, 22-24. 



Door, a lever of the second class, 

 6, 30. 



Doors of ancient dwellings, 9, 



r 55- 



Dove, Heinrich W., his studies 

 in climatology, 3, 199, 200. 



Dow, type-setting machine of, 

 8, 151. 



Drais, Baron von, the earliest 

 bicycle introduced by, 7, 154. 



Draper, Dr. Henry, made the 

 first successful photograph of 

 a nebula, 3, 67. 



Draper, Dr. John W., applica- 

 tion of photography to spec- 

 troscope, 4, 70; in connection 

 with Morse succeeded in mak- 

 ing the first photographic 

 portrait ever taken, 8, 226. 



Dreadnought, Atlantic record 

 for sailing vessels made by, 7, 

 62. 



Driesch, Dr., studies of cell 

 activities and of heredity 

 made at the Marine Biological 

 Laboratory at Naples, 6, 131. 



Drill, a modified form of the 

 lever, 6, 57; used in mining, 

 6, 254. 



Dubois, Dr. Eugene, the dis- 

 coverer of the ape-man fossil 

 on the island of Java, 3, 113; 

 discovers the skull and thigh- 

 bone of the ape-man of Java, 

 6, 173; the "missing link," 6, 

 174; an important addition 

 to our knowledge of man's 

 line of descent made by dis- 

 coveries of, 6, 176. 



Ductless glands, their functions 

 discovered by Claude Bernard, 



[174] 



