INDEX 387 



Pangenesis, 181. 



Paramecium, division of, 173, 175 ; 



responses of, 4. 

 Parasitism, 259 ; 



tends to immobility, 290. 

 Parthenogenesis, 176 ; 



artificial, 176. 

 Particles, 356. 

 Pecten, eye of, 233. 

 Perception 



not merely physical stimulation, 7 ; involves effector activity, 7 ; 



involves deliberative action, 9 ; arises from acting, 50 ; and choice of 



response, 155; is unfamiliar cerebral activity, 8 ; skeletonises conscious- 

 ness, 40. 

 Peridinians, 77, 163 ; 



distribution of, 260. 

 Personal equation, 45. 

 Personality, 167 ; 



an intuition, 167 ; division of, 173 ; is absolute, 48. 

 Pfliiger, and experimental embryology, 131. 

 Phases in physical systems and organic systems, 321 ; 



in transforming systems, 308. 

 Phenomenalism, 46. 

 Photosynthesis, 70, 76, 86. 

 Phototaxis, 144. 

 Phyla 



animal, 247 ; morphology of, 247 ; relations between, 252 ; ancestries 



of, 252. 

 Phylogenies, 253 ; 



are summaries of morphological results, 254 ; indicative of directions 



of evolution, 254 ; criteria of, 253. 

 Phylogeny, 246. 

 Phylum, 210. 

 Physical basis of life, 84. 

 Physico-chemical reactions, 80; 



are directed, 118; the means of development and behaviour in the 



organism, 160. 

 Physico-psychical parallelism, 160. 

 Physics, a statistical science, 116, 377. 

 Physiology 



Galenic, 122 ; an analysis of organic activity, 120, 328. 

 Plants, geological history of, 261 ; 



characterised by immobility, 277 ; contrasted with animals, 277. 

 Platonic ideas, 204. 

 Platyhelminths, morphology of, 248. 

 Poikilothermic animals, 68. 

 Poincare, and Brownian movement, 119. 



