INDEX. 
Note.—T he letters I, II, III, IV refer to the other volumes of the series. Fig¬ 
ures not accompanied by roman numeral designate pages of this volume. 
Acids, IV, 275. 
Adhesion, III, 98. 
Age, rough stone, 86 ; polished, 87; 
bronze, 88. 
Air, pressure, III, 105,107,112,118, 
IV, 20; saturated, 96; weight, 
III, 108. 
Algonkian, 16. 
Alimentary canal, IV, 31. 
Alkalies, IV, 275. 
Alligator, IV, 194. 
Ameba, 215, 216. 
Ammonites, 69. 
Amphiuma, 244. 
Anemometer, 93. 
Animals, cephalopods, 39 ; chip¬ 
munk, III, 59; coyotes. III, 86; 
crinoids, 37 ; deer. III, 76 ; differ¬ 
ences, 224, 225; ground-hog, III, 
70 ; life zones in the forest. III, 58 ; 
minute life, 216 ; prairie-dog. III, 
72; in Age of Keptiles, 72 ; rab¬ 
bit, III, 73; flying squirrel. III, 
62; red squirrel (illus.). Ill, 61; 
wolf. III, 85 ; woodchuck. III, 66 ; 
vertebrates, 44. 
Ants, kinds, IV, 201, 202, 203, 204, 
206, 209. 
Aquarius, 167. 
Aquatic life, minute, 214. 
Archaean, 12, 33. 
Archaeopteryx, 68. 
Arcturus, 156. 
Aries, 159, 160, 161. 
Arietis, 159. 
Armadillo, IV, 199 ; 79, 256. 
Astrology, 138. 
Atavism, 232. 
Atmosphere, 89, 90; pressure of, 
92; see Air and Wind, III, 114. 
Atoms, III, 117. 
Aurora Borealis, IV, 251. 
Auxanometer. IV, 7. 
Bacteria, kinds, 208, 209, 210, 211, 
212, 213. 
Bamboo, IV, 171. 
Bananas, IV, 182. 
Barn, II, 64. 
Barometer, 92, 95. 
Bats, IV, 186 ; flying fox, IV, 188. 
Beans, I, 71. 
Beetle, ladybird, 254; w'ater, 219. 
Birds, classification, IV, 69 ; of the 
north, IV, 241; redbird or gros¬ 
beak, II, 141; rock, IV, 240; 
tropical, IV, 218; quail. III, 74; 
water, IV, 57; wood-thrush, II, 
140; blue jay, II, 101; bobolink, 
II, 2; canary, II, 99; chicadee, 
291 
