INDEX. 



317 



on use of gelatine in experiments 

 on tendrils, 185 ; gypsum me- 

 thod, 119; on heat produced 

 during respiration, 8 ; on intra- 

 molecular respiration, 6 ; on 

 irritable stamens of Gentaurea 

 and Oynara, 196 n.; on John- 

 sou's experiment with geotropic 

 roots, 154 ; on Knop's formula 

 for water culture, 52 n. ; on use 

 of lime water in freeing water 

 from COj, 25; on opening and 

 closing of flowers, 201-203; 

 osmotic researches, 111 n. ; on 

 rigidity of pulvinus of Oxalis, 

 190; on root-tip being sensitive 

 to gravitation, 160 u. ; on sen- 

 sitiveness of Oxalis leaves, 

 189; method of applying con- 

 tinued stimulation to Mimosa, 

 189; modification of Velteu's 

 hot-stage, 13 n. 



Fhajus, leucoplasts of, 30 



Phalaris, heliotropism of, 165 



Phaseolus, twining of, 211 ; water 

 exuded by leaves of, 71 



Phenol, poisonous effect on Oxalis, 

 15 



Phillips, sec Darwin, F. and Phillips 



Phloroglucin, 251, 253 



Phlox, assimilation of sugar by 

 flowers of, 29 



Phosphoric acids, see Acids 



Phosphorus, used to demonstrate 

 evolution of oxygen, 34 ; neces- 

 sity of in water-culture, 55, 58 



Phycomyces, curvature of towards 

 iron, 197 ; observation on growth 

 of, 148 ; growing downwards 

 heliotropically, 167 



Pigment, of Floridese, 46 ; of Poly- 

 Biphonia, 46 



Pigments, of Eicinus, Coleus, Ama- 

 ranthus, 45 



Pinguicula, epinastic leaves of, 

 182 



Pinot's experiment on geotropic 

 roots, 154 



Pisum used in experiments on 

 enzymes, 288 



Pith, extension of in water, 123 



Plantago, epinastic leaves of, 182 



Flasmolysis, microscopic observa- 

 tion of, 113 ; recovery from, 

 113 ; in relation to growth, 135 



Plastic substances, methods of in- 

 vestigating, introductory re- 

 marks, 220; general literature 

 for, 221 ; detection and estima- 

 tion of, 221 



Polariscope, 108 



Polyanthus, elasticity of flower 

 stalk of, 125 



Polygonatum used for negative 

 pressure experiments, 80 



Folysiphonia, pigment of, 46 



Potamogeton used in assimilation 

 experiments, 19, 26 ; evolution 

 of gas by, 30 



Potassium, necessity of in water- 

 culture, 55, 67 



Potato used in experiments on 

 starch, 276 ; on ash, 284 



Potometer, 72 



Pressure, hydrostatic in turgescent 

 tissues, 118, 119 ; negative, 79, 

 80 ; producing recovery of flaccid 

 shoot, 82 ; produced by roots, 

 67 



Primula sinensis, stomata of, 96 



Proctor on Tannins, 248 



Froteids, 231 ; practical classifica- 

 tion of, 232 ; extraction of, 226- 

 227 ; qualitative tests for, 233, 

 284 ; separation from peptones 

 and albumoses, amides, etc., 234; 

 estimation of, 236 ; experiments 

 on, 241, 242, 294, 295, 297, 303, 

 304 



Protoplasm, circulation of, effect 

 of heat on, 12; circulation of 

 affected by chloroform, 15 ; af- 

 fected by COj , 14 ; affected by 

 induced current, 16 



Puccinia, culture of, 63 



Pulvinus of Oxalis, rigidity of, 190, 

 191 ; tension in, 129 



Fythium, injury to water-cultures 

 by, 53 



Ranunculus fiearia, stomata of, 

 96, 99 



