INDEX 



318 



Photo-synthesis ( Carbon assimila- 

 tion), 11, 19, 23, 64, 71. 



Phycocyanin, 37. 



Phycoei-ythrin, 71. 



Phycomycetes (see also " Alga- 

 fungi"), 81, 82, 85, 86, 92, 95, 99, 

 288, Figs. 21, 22. 



PhyllodiQm,271,274. 



Phylloglossum, 146. 



Phyllosiphou, 85. 



Phytophtliora infestans, 82. 



Pickerel-weed {Pontederia cordata) 

 189, Fig. 46. 



Pigments, 22, 49, 64, 263, 274, 297; 

 of Marine Algse, 64, 263. 



Pig-weed family (Chenopodiacese) , 

 208. 



Pine, Pinus, 169, 170, 227, 238, 245 ; 

 P. contorta, 170, Fig. 42. 



Pineapple, P. family (see also 

 "Bromeliaceae"), 194, 198, 238. 



Pine-sap (Monotropa hypopitys) , 213, 

 270, Figs. 52, 59. 



Pinguioula, 259. 



Pink, P. family (CaryophyllaceEe), 

 209, 248. 



Pinnularia viridis, 65, Fig. 15. 



Piperineae (see " Pepper"). 



Pistia, 271. 



Pistil (see also "Carpel"), 179, 181, 

 189, 190, 1!)1, 194, 195, 197, 210, 213, 

 215, 216, 245, 250, 253, 254, 256. 



Pisnm, 210. 



Pitcher-plant (see also "Darling- 

 tonia," "Nepenthes," " Sarra- 

 cenia ") , 205, 209, 258, Fig. 58. 



Placenta, 181,'206, 209. 



Plankton, 64. 



Plantain (Musa), 193; (Plantago), 

 241, 251. 



Plasmodium, 23, 31, 32, 34, Fig, 4. 



Plastids (see also " Chloroplast," 

 "Chromatophore"), 0, 



Pleodorina Californica, 39, Fig. 6. 



Pleurococcus, 43, 47, Fig. 7. 



Pliocene formations, 227. 



Plum, 93, 165. 



Podophyllum, 236. 



Poinsettia, 210, 248. 



Poisonous protective secretions, 260. 



Poison ivy (.Rhus toxicodendron), 

 237. 



Polar nuclei, 179. 



Pollen, Pollen-spore, 28, 159, 160, 163, 

 164, 165, 169, 170, 174, 178, 179, 180, 

 181, 195, 203, 2.50, 251, 252, 253, 254, 

 255, 256, 257, 294. ' 



Pollen-chamber (of Cycads), 163, 

 Fig. 40. 



Pollen-sac, 159, 160, 169, 179, 202, 293, 

 Figs. 40, 41, 42. 



Pollen-tube, 160, 163, 104, 169, 170, 

 179, 180, 181, 292, Figs. 40, 42. 



Pollination, 28, 164, 169, 178, 180, 181, 

 189, 190, 194, 206, 244, 245, 246, 247, 

 248, 249, 250, 251, 252, 253, 254, 255, 

 256; by birds, 249; by insects, 245, 

 246, 247, 248, 249, 250, 251, 252, 253, 

 254, 255, 256 ; by snails, 247. 



Polliniura, 195, 254, 255, 256, Fig. 56. 



Polycarpicaj, 207, 208,. 209, 218, 219, 

 Fig. 50. 



Polygonaceje, 208. 



Polygonum, 206, Fig. 49. 



Polypodiaceie, 138, 151. 



Polypodium, 135, 234; P. falcatum, 

 135, Fig. 35. 



Polyporus, 87. 



Polysiphonia, 72, 74, Figs. 19, 20. 



Pomegranate, 211. 



Pond-scum (see also " Conjugatae," 

 " Spirogyra "), 59, 60, 85, Fig. 13. 



Pond-weeds (see also "Naiadacese"), 

 28, 178, 186, 198, Fig. 43. 



Pontederia, 189, Fig. 46. 



Poplar, 206, 228, 229, 230. 



Poppy, P. family (see also Esch- 

 scholtzia," " Papaveracese "), 209, 

 241. 



Potassium, 2. 



Potato-fungus (Phytophthora infes- 

 tans), 82. 



Prairies, 238, 241. 



Prickles, 28, 260, 295. 



Primrose, P. family (PrimulinEe), 

 213, 214. 



Procarp (of Rhodophycese) , 74, 75, 

 Fig. 20. 



