PAGE 



aborigines ................... 3^2 



acids, humous .......... 95. 96, 34 8 



Acilius ................... 333 



Acorus ...................... 157 



Acroperus harpae .......... 300, 301 



adaptations ........... 260, 274, 277 



Adineta ..................... 299 



adjustment ............... 248, 261 



adjustments, individual ....... 242 



mutual ....... 242, 282 



adjustability to waves ......... 319 



aeration ..................... 73 



Agassiz, Louis ................ 19 



Agraylea .................... 216 



agriculture ................ 379, 42 



agricultural crops ............. 404 



air-breathing ................ 231 



air-chambers .............. 275, 277 



air-spaces ................. 265, 271 



air-tubes .................... 279 



albumins .................... 48 



alder ................. 158, 351, 352 



ale-wives ................. 232 



algae, 26, 28, 29, 45, 46, 



100, 101, 102 



151 



373 



72, 



110, 119, 137, 

 169, 1 80, 181, 



220, 223, 295, 

 304, 307, 311, 



144, 145, 



183, 189, 217, 

 296, 301, 302, 



322, 391, 345, 356, 362, 373, 



390, 395 



algae, "blanket" ....... 336, 345, 399 



blue-green 



109, 132, 297, 302, 326 

 filamentous blue-green 296, 310 

 brown .............. 135, 136 



fresh water ............. 101 



free-swimming ........ 28, 339 



gelatinous ............. 101 



green ....... 124, 129,299,302 



filamentous green ....... 124 



plancton ......... 50, 244, 392 



protococcoid green ...... 318 



lime-secreting .......... 50 



marine ................ 135 



of ponds ............... 335 



red ................. 135, 136 



sessile .......... 120, 126, 336 



PAGE 



algae, siphon 121 



" slime-coat 335 



tufted 112, 126 



" unicellular 112, 126 



Allen, Arthur A 95, 342 



Alismaceae 156 



Alisma 334 



alligators 238 



Ambystoma tigrinum 237, 342 



ammonia 25, 48, 49, 140 



Amoeba 159 



amphibians. . . 148, 231, 236, 237, 337 



Amphipoda 189, 191, 341 



Amphizoidae 224 



Anabaena 132, 133, 295, 296, 297, 

 305, 38, 392 



Anacharis 155 



Anapus 299 



Anax 155,341,389 



junius 196 



Ancylus 182, 260, 370, 373 



Andromeda 157, 350 



angling 407 



animalcules 295 



animal forage 387, 399 



animal husbandry 384, 400, 408 



animals, hoofed 312 



animals, limpet-shaped 260 



animal life of marshes 345 



animal population 324 



animals, warm-blooded 273 



Ankistrodesmus falcatus 129 



" setigerus. . . 129, 131 

 Anodonta 180, 288, 290 



edentula 324 



" grandis 324 



imbecillus 288 



antennae 185, 189, 247, 251, 312 



Anthomyid fly 359 



Anthophysa 162 



Anthony, Maude H 214, 215 



Anuraea 299, 300, 303 



Aphanizomenon 297, 304, 392 



apical buds 154, 138 



Appalachian hills 60 



applied science 21 



Apsilus 299 



421 



