432 



Index 



PAGE 



Nepidae .................... 212 



Netrium .................... 119 



nets, of silk bolting-cloth ...... 18, 20 



Neuroptera ........... 195, 202, 212 



newt, vermilion-spotted ........ 237 



New York State Museum ...... 165 



nigger-heads ................. 291 



nightshade bittersweet ......... 345 



Nitella ............... 137, 138, 139 



nitrates ............. 48, 49, 50, 141 



nitrites ................. 48, 49, 141 



Nitrogen 43, 47, 48, 50, 139, 141, 348, 



nodes ...................... 138 



Nostoc ............... 133,282,337 



nostrils ..................... 273 



Noteus ..................... 299 



Notholca ......... 246, 299, 300, 303 



Notodromas .............. 188, 328 



Notommata parasita .......... 282 



Notonecta ................ 276, 337 



nucleus ................... 117, 121 



Nymphasa ................... 334 



nymph ................... 201, 204 



nymph, damselfly ............. 208 



dragonfly . . 250, 252, 340, 360 

 Hexagenia ........... 398 



mayfly 278, 340, 341, 369, 



387, 388, 390, 396 

 stonefly ........... 204, 279 



Obovaria ellipsis .............. 291 



Odonata .............. 195, 207, 345 



CEdogonium .......... 124, 125, 126 



offsets ...................... 272 



oils ......................... 273 



Oligochaete ............... 173, 250 



Oocystis .................. 129, 131 



ooze" ..................... 173, 251 



opercula .................... 253 



operculum ................... 182 



Ophiocytium .............. 129, 131 



Ophrydium .................. 161 



orchids ................... 158, 351 



organs, locomotor ............. 246 



organisms, chlorophyl-bearing 71 

 littoral ..... 314, 315, 356 



lotic .............. 263 



orl flies .................. 213, 280 



Oscillatoria ....... 109, 133, 245, 297 



osmotic pressure .......... 245, 272 



osteole ...................... 164 



Ostracods. 183, 188, 193, 225, 328, 345 



PAGE 



otter 241, 274 



overflow 87 



oxydation 44, 5 1 



oxygen 43, 44, 45, 47, 48, 72, 



101, 120, 139, 183, 254, 263, 



277, 309, 3t 326, 329, 332, 

 339, 345 



oxygen, consumption of 44 



dissolved 80 



excess 44 



free 310 



oxylophytes 348 



oysters 379 



Pacific Ocean 28 



paddle-fish 333 



Palaemonetes 192, 393 



Palmer 48 



Pandorina 103, 104 



Paper making 381 



Paramecium 160, 165 



Paraponyx 219, 341 



parasites 18, 120, 175, 282, 296 



Parnidae 224 



Parnids 370 



Paulmier 392 



peat 95, 96, 147, 348, 350, 352 



Pectinatella 168, 169, 247 



Pedalion 299, 300 



Pediastrum 123, 245, 299, 303 



Pedicia albivitta 256 



peeper 236, 237 



Peltandra 157, 334 



Peltodytes 223, 224 



Penium 119 



peptones 48 



perch 232, 233, 291, 306 



perch, yellow 234 



Peridinium 108, 296 



Perla 203, 204 



petioles 271 



Phaeophyceae 135 



Philotria" 155, 156, 228, 319, 321 



Philodina 299, 318 



photomicrographs 117 



photosnythesis . .26, 28, 29, 45, 46, 71 



Phragmites 343 



Phryganea 34 1 



Physa 182, 337 



pickerel-weed. 156, 157, 321, 334, 405 



pike 231, 232, 233, 235, 387 



pipewort 319 



Pisidium 341, 345 



