354 



Perception, of contact stimuli, 313. 319; of geo- 

 tropic stimuli, 297; of phototropic stimuli, 281 

 Periderm, of potato tuber, 106 

 Periodic movements, of floral parts, 291 

 Periodicity, in transfer of carbohydrates, 150; in 



transpiration, 138; in growth, 275 

 Permeability, of protoplasm, 119, 120, 270, 271, 318 

 Peroxidases, 167, 223, 225, 226 

 Peroxides, 167 

 Peru, 323 



Pettenkoffer tubes, 215, 216 

 Petri dish, 61 

 Petrograd, 256, 257 

 Petrolatum, 107 



Petruschewsky, see Petrushevskaia. 

 Petrushevskaia, on temperature and enzyme action, 



169 

 Pfannenstiel, see Willst ätter and P. 

 Pfeffer, Osmotische Untersuchungen, 112, 113; on 

 absorption of aniline dyes, 119; on selective 

 absorption, 121; on proteins and asparagin, 

 171; on respiration, 201; on respiration and 

 wounding, 213; on intramolecular respiration, 

 221; plant physiology, 4» 250; on day and 

 night movements of floral parts, 291, 316; on 

 pressures exerted by growth, 303, 304, 305; on 

 contact sensibility, 311; Pfeffer clinostat, 293; 

 osmotic cell, 112 

 Pfingstberg, 55 

 Pflüger, on respiration, 201 

 Phaeophytin, 13 

 Pharbitis, 312 

 Phaseolus (see also bean), 148, 188, 247. 263, 277, 



281, 311 

 Phenol, 58, 205 

 Phenolphthalein, 101 

 Phenological observations, 255, 256 

 Phenyl-alanin. 160, 161 

 Phloem, 149, 150 

 Phosphates, 91, 202, 214, 227 

 Phosphatides, 85; and lipoids, 183-185 

 Phosphorite, 94-96 

 Phosphorus, 3, 67, 82, 85, 89, 90, 93. 104. 154, 162, 



174. 181, 183, 28s 

 Photographic paper, 290 

 Photolepsy (see also Lichtgenuss) , 289 

 Photometric sensitiveness, 276 



Photosynthesis, 3, 4; role of chlorophyll in, 18, 19; 

 role of carotin in, 19; products of, 28-32; in- 

 fluence of conditions on, 34~3б; and light, 21, 

 28, 32-36, 212; and asparagin, 171; and cane 

 sugar, 186; and energy circulation, 232; and 

 etiolation, 283-285; and development, 284, 

 288 

 Phototropism, 275. 276, 279, 280, 297; of flowers, 

 278; of leaves, 277, 278; of moulds, 279; of 

 roots, 279; of tendrils, 313 

 Phycocyanin, 21; phycoerythrin, 20, 21; phyco- 



phaein, 21 

 Phyllocaclus, 283 

 Phyllocyanin, 11 

 Phyllophyllin, 13 

 Phylloporphyrin, 11-13 

 Phylloxanthin, 11 



Phylogeny, of plants, 302; of twining habit, 314 

 Physiography, 274 

 Physiological dryness, of soil, 101 



Physiology, xxvii, 274; the cell as physiological unit, 

 154 



Phytin, 185 



Phytoalbumins, 158 



Phytoglobulins, 158, 159 



Phytyl, in chlorophyll molecule, 8, 9, 13 

 Picea, 324, 325 



Pickering, on toxins in soil, 99, 101 



Pieters, on tissue strains as stimuli, 302 



Pigments (see also respiration pigments), 21, 119, 

 120; accompanying chlorophyll, 19-21; comple- 

 mentary, 26 



Pilobolus, 279, 291 



Pine, 27, 241, 254 



Pisum (see also pea), 165, 184, 253. 281 



Pith, 150 



Pitsch, on nitrate fertilizers, 72; P. and van Haarst, 

 on nitrate fertilizers, 72 



Plagiotropism, 293 



Plant lice, 86 



Plasmodium, 154 



Plasmolysis, 114-116, 121, 242, 244 



Plaster, of Paris, 44, 125, 146, 303, 304 



Plastic materials, 149; transfer of, 133 



Plastiline, 135 



Plastin, 192 



Platinic chloride, xxix, 90, 163 



Plimmer, on proteins, 155, 162; P. and Scott, on 

 phosphoproteins, 162 



Podsol, 95, 96 



Poisoning, compared to nutrition, 227 



Poisons, 182, 213; and geotropism, 297; and nuta- 

 tion, 261, 262; and respiration, 226, 227; and 

 starch formation, 38; for enzymes, 170 



Polarity, 329 



Pollacci, on aldehyde in plants, 30 



Pollen, 334; chemotropism of pollen tubes, 333 



Polovtsov, on respiration of fatty seeds, 215 



Polygonum, 187, 282, 311 



Polymerization, 286 



Polymorphysm, of hay bacillus, 300 



Polypeptides, 161, 176 



Polyporus, 186 



Polzeniusz, see Godlewski and P. 



Poppy, 159, 191, 215 



Pores, diffusion through, 108, 109 



Posternak, on formation of oxymethyl-phosphoric 

 acid in leaves, 31 



Potassium, 73. 82, 88-90, 92, 104, 285; carbonate, 

 46; chloride, 84, 85; chloroplatinate, 90; citrate, 

 117; dichromate, 15, 23, 25; ferrocyanide, 91, 

 112; hydroxide, 4, 6, 28, 53. 156, 179. 216, 

 259; iodide-iodine solution. 28; myronate, 166; 

 nitrate, 82, 84, 113-117, 118, 122, 123, 208, 242; 

 permanganate, 25, 58; phosphate, 48; silicate, 

 46; sulphate, 87, 117, 118, 166 



Potato, 87, 101, 142, 157, 182, 185, 214, 28r, 283, 

 325, 326 



Potonie, on morphology and paleontology, 302 



Pouget and Chouchak, on "soil sickness," 101 



Prantl, on guttation, 140 



Prazmovskii, on bacteria of root tubercles, 76 



Prazmowski, see Prazmovskii. 



Precipitation membranes, 112, 119, 243 



Precipitin, in rabbit, 331 



Presentation time, in geotropic response, 294 



Preserves, and sterilization, 53 



