Index 



433 



PAGE 



pitcher-plant 283, 284, 350, 351 



Pi tot-tube current meter 86 



Placobdella 176 



Plagiola 289, 291 



Plagues of Egypt 14 



Planaria 263 



planarians 170, 171 



plancton 18, 20, 28, 45, 48, 49, 

 70, 72, 85, 123, 129, 130, 

 131, 134, 135, 161, 164, 166, 

 185, 189, 194, 235, 243, 294 

 295, 296, 299, 300, 301, 302, 

 303, 313, 322, 341, 356, 357, 

 387, 388, 389, 391, 394 



plancton animals 299, 301, 325 



Crustacea 391 



entomostraca 393 



feeders 



235 



gatherers 263, 270 



" local abundance 306 



" net 115, 160 



of open waters 331 



organisms 248, 296 



" pulses 305 



shoreward range 307 



" of surface 327 



plancton strainers 313 



planctonts, summer 309 



synthetic 308 



Planorbis 155, 182, 337, 345 



plant assimilation 26 



plant infusions 160, 165 



plants, chlorophyl-bearing . . .44, 326 



" floating 150 



" insectivorous 282, 283 



submerged 155, 334 



" transpiration of 56 



" vascular. . .270, 316, 322, 356 



Platydorina 104 



Platypeza 380 



pleasure grounds 21 



Plecoptera 195, 203 



Pleurotaenium 119 



pliancy 271 



Ploesoma 299 



plover 239 



Plumatella 166, 167, 169 



plumes 248 



plunge basins 63 



Podilvmbus 240 



Podophrya 162 



pollen grains 296 



pollen tubes Ipl 



_ , PAGE 



Polyarthra 25 



Polycystis 



Polycentropus \aq 



Polygonum 75,34 



Polyphemus 301 



Polytrichium 



Polyzoans 



pond culture 



pond-dwellers '1 - 2 



pond at Lake Forest, 111 410 



pond, making of a 400 



Pond, Old Forge 



Pond, Parker's 91 



pond-scums 10 1 



pond-snails 327 



pondweed, ruffled 152, 272 



" 1 sago 326, 3 so, 387 



pondweeds 152, 153, 240, 272, 319, 

 321, 334, 352, 39*. 



A A 4 ° 5 



pondweed zone 2,^2, 233 



ponds 59, 121, 155, 167,299, 3.7, 316, 

 333, 345, 356, 397 



ponds, hatching 163 



11 inclosed 



Pontederiaceae 156 



Pontederia 157, 3- ; 



pools 14, 57, 64, 81, 133, 156, 163, 

 164, 184, 210, 307, 310, 319, :,22, 

 356 



pools, impermanent 157 



" polluted 17,; 



" rainwater 1 B4 



" stagnant 127, i/ 



" temporary 177, 227, 263 



Potamogeton 152, 153, 220, 240, 321, 



334,336,387 



Potentilla 344 



prawn, freshwater 



prawns 1 \ ■ . 



Precession of the Equinoxes. . 



precipitation 55 



Priocnemis 



production, decline of 



products, animal 



" gelatinous 244, . 



" metabolic 



" mucilaginous 245 



prolongations 



propagation 



propagation, artificial 



propulsion 



propulsion, caudal 



