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, 1 10-14. 



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 

 names: 



— Acris gryllus, 135, 169, 296. 



— Ambly stoma tigrinum, 149, 278, 282, 



296. 

 — Bufo lentiginosis , 187, 296. 

 — Chorophilus nigritus, 195, 206, 283, 296. 

 — Diemictylus viridescens, 121, 149, 156. 

 — -Hemidactylium scutatum, 237. 

 — Hyla: 



pickeringii, 194, 195, 196, 205, 207, 



234,. 253. 



versicolor, 205, 234. 

 — Necturus maculosus, 130. 

 — Plethodon: 



cinereus, 197, 207, 243, 244, 256. 



glutinosus, 181, 183, 207. 

 — Rana: 



catesbeiana, 171. 



clamata, 169, 171, 195. 



pipiens, 156, 169, 195, 296. 



sylvatica, 195, 206, 207, 243, 244, 256. 

 Amphipods, 69, 70. 

 Amphipods or Amphipoda, scientific 



— Eucrangonyx, 1 74 : 



gracilis, 80, 85, 114, 118, 150, 154, 

 185, 206. 

 — Gammarus fascialus, 90, 93, 104, 114, 



118, 123, 172. 

 — Hyalella knickerbockeri, 78, 104, 114, 



121, 123, 135, 144, 154. 

 — Pontoporeia hoyi, 80, 81, 85. 



Anemotaxis, 161. 



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, 1 79 : 

 inconstans, 185. 

 — Limnodrilus claparedianus , 83. 

 Ant-lion, 229, 232. 



Ants: 167; aphids and, 234, 255, 290; 



swarming of, 227. 

 Ants, scientific names: 

 — A phaenogaster: 



tennesseensis, 256. 



treatae, 188. 

 — Camponotus, 202: 



herculeanus ligniperdus novebora- 



censis, 207, 255. 



herculeanus pennsylvanicus, 253. 

 —Dolichoderus mariae, 204. 

 — Formica: 



cinerea neocinerea, 298. 



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- 

 41. 



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