30 



INDEX 



References are to pages 



Planarian worm (fig.) . . 76, 77 



Plant, biology ....... 259 



cell (fig.) 4 



conditions, change of ... . 400 



ecology, definition of ... . 399 



food, of interest to farmer . . 402 



lice 41 



injurious to corn plant . . 316 



members of Hemiptera . . 24 



on fern (fig.) 24 



protected by ants .... 41 



life, mystery of 404 



peculiarities of 389 



or animal matter food of bac- 

 teria 344 



poison 233 



Plant-eating animals . . . 161 



Plant societies 393 



Plant succession 400 



Plantation in the Adiron- 

 dack^ (fig.) .... 385, 386 

 Planting- young- trees in the 



Adirondacks (fig.) .... 384 

 Plants as organisms, interest 



in 402 



Plants decomposed by bac- 

 teria 345 



Plasma 203 



Plecoptera, order of insects . 20 

 Pleurococcus, appearance of 



(fig-) 338 



described 338 



example of alga 7 



group of cells 339 



where found 338 



Plum, example of drupe . . . 310 



produced by rose family . . 329 



Plumage, discussed .... 139 

 Plumule, connection with seed 



leaves 261 



defined 260 



part of embryo 301 



Pneumonia 234 



Pod of bean 260, 308 



Poison, defined 221 



in tobacco smoke 230 



Poisonous character, of crow- 

 foot family 327 



of lizards — Gila monster (fig.) 135 



of snakes 132 



character, 



con- 



Poisonous 

 tinned 



of toxins 345 



of plants of nightshade family 331 



Pollen, cell (male parent) . . 299 



distributed by wind .... 305 



of pine (fig.) 387 



produced by stamens .... 297 



sacs of pine 379 



tube, formation of 300 



of pine 381 



Pollen grains growing 



through pistil (fig.) ... 300 



Pollination, by wind .... 305 



definition of 297 



step in the production of fruit . 308 



Pollution of -water .... 247 

 Polytrichum, laboratory study 



of 366 



Pome, a fleshy fruit (fig.) . . 309 



Pond scum, habitat of . . . 339 



Pome fruits, defined .... 310 



Poppy, capsule of 310 



fruit of (fig.) ....... 308 



Pores of sponge 58 



Porifera, classified 6 



Pork, inspection of 78 



trichinella in 77 



value of as food 178 



Posterior adductor muscle 



of clam 95 



Potassium, a chemical element 



found in living things ... 9 



contained in food 173 



Potassium permanganate, a 



disinfectant 253 



Potassium phosphate, in Pas- 

 teur solution 356 



Potato, a food plant of the 



nightshade family .... 331 



(fig.) 285 



beetles, injurious insects . . 26 



blight, a fungus 360 



production, map of .... 335 



response of, to light .... 393 



value of, as food 178 



Poultry, destroyed by certain 



hawks 145 



Preecocial birds, defined . . 143 



nest of bittern (fig.) .... 142 



