552 



INDEX. 



Percaand Amiurus nebulosus, food 

 of, compared, 499. 

 lutea, 434t, 468t. 



Perch, Common, 434t, 460t, 479t. 

 and bull-heads, food of, com- 

 pared, 499. 

 Pirate, 499*. 



]'ercidte, 472t. 



Peridermium, 155, 212, 215, 218, 241. 



Peridporiace?e, 393. 



Peronospora, 395, 423. 



Phanerogamia, 11. 



Phenacobius rairabilis and No- 

 tropis whipplei, food of, 

 compared, 500. 



phenacobius, IS'otropis, 137. 



Philadelphia Academy of Nat- 

 ural Sciences, Proceedings, 

 cited, 73. 



Phragmicoma, 51, 73, 117, 118, 124. 



Phragmidium, 155, 160, 171, 204, 

 219, 221. 



Phragmospora, 212, 213. 



Phryganeidjie, 442t, 469t, 473t. 



larvfe, 454t, 461t, 466t, 4701, 

 485t. 



Phyllactinia, 392, 396, 397, 411, 414. 



Physa, 443t, 460t, 461t, 462t, 4821. 



Phytophthora, 423. 



Pickerel, 434*. 

 Brook, 435. 

 Grass, 434. 



picta, Mamestra, 258, 305, 320. 



Pieris brassicte, disease of, 267. 

 rap?e, disease of, 259. See Cab- 

 bage Worm, European. 



Pike, 434t* 



Wall-eyed, 503*. 



Pileolaria, 158, 159. 



Pirate Perch, 499*. 



Pisidium, 461t. 



Placopharynx, 440. 



carinatus, 441*, 470*. 



Plagiochasma, 43. 



Plagiochila, 53, HI, 116, 118, 124. 



Planarian worm, 463t, 489t. 



Planorbis, 4431, 450t, 464t. 



Plants, leaves of, 4911. 

 structures, 491t. 

 unicellular, 439t, 495t. See 



under Vegetation, 

 platystomus, Lepidosteus, 464*, 



468*. 

 Pleochieta, 398. 

 Pleuranthe, 52, 90, 118. 

 Pleuroschisraa, 82, 83, 84, 125. 

 Pleuroxus, 450t, 4521, 463t. 

 Pleurozia, 125. 

 Plumatella, 4421, 450t, 452t, 458t, 



467t, 469t, 473t, 488t, 489t. 

 Podisoma, 210. 



Podosphsera, 388, 392, 397, 412. 

 Porella, 76. 



Polyodon spathula, 464* 468*. 

 Polyodontidie, 464. 

 Polyzoa, 450t, 454, 471t, 488t, 489t. 

 Pomoxys, 434t, 468t. 



nigromaculatus and Lepomis 



pal lidus, food of, compared, 



.501. 

 and Ictalurus punctatus, food 



of, compared, 498. 

 Porifera, 473t. 

 Potamogeton, 4571, 460t, 462t, 466t, 



473t. 

 Potash, caustic, effect of, upon bac- 

 teria, 318. 

 Prairie Farmer cited, 260. 

 Preissia, 31, 33, 117. 

 Proceedings Philadelphia Acad- 

 emy Natural Sciences 



cited, 73. 

 propinquus, Cambarus, 434t. 

 Protococcus, 448t, 451. 

 Protophyta, 11. 

 Protozoa, 448t, 451t, 454t, 455t, 465, 



4«59t, 47 It, 473t, 489t. 

 Pteridophyta, 11. 

 Ptilidmm, 81. 

 Puccinia, 145, 148, 155, 160, 161, 163, 



165, 170, 206, 208, 218, 221, 



231, 234, 235, 241. 

 Pucciniopsis, 171. 

 pulex, Daphnia, 4671- 



