INDEX 



313 



Photo-synthesis ( Carbon assimila- 

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



Phycocyauin, 37. 



Phycoerythrin, 71. 



Phycomycetes (see also " Alga- 

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

 288, Figs. 21, 22. 



Phyllodiura, 271, 274. 



Phylloglossum, 146. 



Phyllosiphon, 85. 



Phytophthora infestans, 82. 



Pickerel-weed (Pontederia cordatd) 

 189, Fig. 46. 



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

 of Marine Algae, 64, 263. 



Pig-weed family (Cheuopocliaceee) , 

 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. 



Pinguicula, 259. 



Pink, P. family (Caryophyllacese), 

 209, 248. 



Pinnularia viridis, 65, Fig. 15. 



Piperineae (see " Pepper"). 



Pistia, 271. 



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

 189, 190, 191, 194, 195, 197, 210, 213, 

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



Pisum, 210. 



Pitcher-plant (see also "Darling- 

 tonia," "Nepenthes," " Sarra- 

 ceuia "), 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 ") , 6. 



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, 

 104, 165, 169, 170, 174, 178, 179, 180, 

 181, 195, 203, 250, 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, 164, 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. 



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



Polycarpicse, 207, 208, 209, 218, 219, 

 Fig. 50. 



Polygonaceae, 208. 



Polygonum, 206, Fig. 49. 



Polypodiaceae, 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 "Naiadaceae"), 

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



Pontederia, 189, Fig. 46. 



Poplar, 206, 228, 229, 230. 



Poppy, P. family (see also Esch- 

 scholtzia," " Papaveraceae "), 209, 

 241. 



Potassium, 2. 



Potato-fungus (Phytophthora infes- 

 tans), 82. 



Prairies, 238, 241. 



Prickles, 28, 260, 295. 



Primrose, P. family (Primulinae) , 

 213, 214. 



Procarp (of Rhodophycese) , 74, 75, 

 Fig. 20. 



