INDEX 



445 



Palate, soft, 354. 



Pancreas, position of, 352, 359 ; ' 



structure of, 359. 

 Pancreatic juice, function of, 360. 

 Papillae, 355. 

 Pappus, 54. 

 Paramoecium, 191, 192 ; 



response to stimuli in, 191. 

 Parapodia, 216. 

 Parasites, 149. 

 Parasitism in insects, 257. 

 Pasteurizing, 178. 

 Patent medicines, alcohol in, 350. 

 Pearl formation, 270. 

 "Peepers," 291. 

 Pepo, 63. 

 Pepsin, 358. 

 Peptone, 358 ; 



changed to proteid, 366. 

 Pericardium, 370. 

 Perspiration, insensible, 392. 

 Petal, 34. 

 Phagocytes, 369. 

 Pharynx, 354. 



Phosphorus, in living matter, 331. 

 Photosynthesis, 124. 

 Physiology, human, defined, 13. 

 Pigeon-wheat moss, 152. 

 Pistil, 34, 36. 

 Pitcher plants, 131. 

 Plant, and animal compared, 26. 

 Plant body, simplest, 144. 

 Plant breeding, 81. 

 Plant invasions, 168. 

 Plant life, in temperate zones, 165; 



forms of, 144 ; 



in tropics, 164 ; 



upon mountains, 164. 

 Plant modification, cold a factor in, 

 164; 



water a factor in, 160, 161, 162 ; 



wind a factor in, 163. 

 Plant outpost, a, 169. 

 Plant societies, 166, 167. 

 Plants, beneficial and harmful, 171 ; 



classification of, 157 ; 



harm done by, 170 ; 



modified by surroundings, 159, 160 ; 



relations to animals, 13, 15, 184, 

 185, 186. 



Plasma of blood, 366. 

 Plasmodium malarice, 196. 

 Pleura, 383. 

 Pleurococcus, 148. 

 Plumule, 65. 

 Pocket garden, 85. 

 Pollen, growth of, 35, 36. 

 Pollen, protection of, 49. 

 Pollination, 38 ; 



artificial, 50 ; 



by humming bird, 43 ; 



by insects, 40 ; 



by water, 47 ; 



by wind, 46 ; 



history of, 37. 

 Polycotyledon, 73. 

 Polyphemus moth, 239. 

 Polypody, 154. 

 Polyps, coral, 209 ; 



hydroid, 208. 

 Pond lilies, 159. 

 Pond scum, 147. 

 Potato tuber, 111. 

 Premolars, 355. 

 Proboscis, 43. 



Proglottids of tapeworm, 217. 

 Prolegs, 238. 

 Pronuba, 45. 

 Protective resemblance, 249, 250 



seasonal, 309. 



Proteid making in plant, 124. 

 Proteids, 24, 67, 330 ; 



building of, 106. 

 Prothallus, 154, 155. 

 Protonema, 153. 

 Protoplasm, composition of, 31 ; 



properties of, 32. 

 Protozoa, 190; 



classification of, 198 ; 



habitat of, 195 ; 



relation to disease, 196 ; 



use as food, 195. 

 Pseudopodia, 193. 

 Pteridophytes, 157. 

 Ptomaines, 177. 

 Ptyalin, 357. 

 Pulmonates, 271. 

 Pulse, cause of, 374. 

 Pupa, 238, 239. 

 Pylorus, 357. 



