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, 



351 



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 



Nymphaea 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 



or! 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, 



loi, 120, 139, 183, 254, 263, 



277, 309, 311, 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 38I 



Paramecium 160, 165 



Paraponyx 219, 341 



parasites 18, 120, 175, 282, 296 



Parnidae 224 



Pamids • 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 



