INDEX OF SUBJECTS 
Absorption of dissolved foods by aquatic 
animals, 58. 
Acclimatization, isopods, 92. 
Acorns: eaten by squirrels, 233; weevils, 
233. 
Activities: classification of, 31; dis- 
tribution and, 299-305; environment 
and, 26-30; form and, 26-27; most 
limited, 304. 
Adaptation: 24-26; of May-fly nymphs, 
96. 
African game, 7. 
Age of habitats: 44; forest, 218, 247; 
lakes; 133-34; ponds, -138, 152; 
quantity of life and, 68-69; streams, 
86, I10-14. 
Agriculture: communities of, 13, 15-17; 
near cities, 19. 
Algae: 59, 65, 70; depth limit in Lake 
Michigan, 74; filamentous, 131, 148; 
on mollusk shells, 126. 
Ammonia: in sewage, 17; in air and 
water, 59, 60; in nitrogen balance, 66; 
reactions of fishes to, 60. 
Amphibians or Amphibia, scientific 
nhames: 
—Acris gryllus, 135, 169, 296. 
Amblystoma tigrinum, 149, 278, 282, 
206. 
—Bufo lentiginosus, 187, 296. 
—Chorophilus nigritus, 195, 206, 283, 296. 
—Diemictylus viridescens, 121, 149, 1506. 
—Hemidactylium scutatum, 237. 
—Hyla: 
pickeringit, 194, 195, 196, 205, 207, 
234, 253+ 
versicolor, 205, 234. 
—WNecturus maculosus, 130. 
—Plethodon: 
cinereus, 197, 207, 243, 244, 256. 
glutinosus, 181, 183, 207. 
—Rana: 
catesbéiana, 171. 
clamata, 169, 171, 195. 
pipiens, 156, 169, 195, 200. 
sylvatica, 195, 206, 207, 243, 244, 2506. 
Amphipods, 69, 70. 
Amphipods or Amphipoda, 
names: 
scientific 
—Eucrangonyx, 174: 
gracilis, 80, 85, 114, 118, 150, 154, 
185, 206. 
—Gammarus fasciatus, 90, 93, 104, 114, 
TOs Lee ety. 
—Hyalella knickerbockeri, 78, 
I21, 123, 135, 144, 154. 
—Pontoporeia hoyi, 80, 81, 85. 
Anemotaxis, 161. 
104, IT4, 
Animal organism, 22-33. 
Animals: disappearance of, near Chicago, 
13-15; economic value of, 20; rela- 
tion of, to man, 5—20. 
Annelida, 103. See also Leeches. 
—Lumbriculus, 179: 
inconstans, 185. 
—Limnodrilus claparedianus, 83. 
Ant-lion, 229, 232. 
Ants: 167; aphids and, 234, 255, 290; 
swarming of, 227. 
Ants, scientific names: 
—A phaenogaster: 
lennesseensis, 256. 
treatae, 188. 
—Camponotus, 202: 
herculeanus ligniperdus 
censiS, 207, 255. 
herculeanus pennsylvanicus, 253. 
—Dolichoderus mariae, 204. 
—Formica: 
cinerea neocinered, 208. 
fusca, 204, 205, 207. 
fusca subsericea, 187. 
subpolita neogagates, 282, 297. 
—Lasius: 
niger americanus, 227, 252. 
umbratus mixtus aphidicola, 234, 255. 
—Myrmica rubra scabrinodis, 288, 297. 
—Ponera coarctala, 187. 
Aphids: 167, 245; ants and, 234, 290; 
cherry, 223-24; consocies, 37, 214, 290; 
fecundity of, 18, 35; grain, 18; housed 
by ants, 234. 
Aphis-lions, 167, 290-91. 
Aquatic conditions: 58-67; chemical, 
58-60; food, 65-67; physical, 60-65. 
Ash: 190; galls of midrib, 192. 
Association: 37; defined, 38; listed, 39- 
4I. 
novebora- 
343 
