Index. 



Organic combination, hypothesis Pineal gland, 196, 288 

 of, 150, 240 j Pipistrelle, wing of, 64 



Organic evolution, 177 ; as basis , Pipits as illustrating divergence, 

 of comparative psychology, I 97 

 336 Pitch, musical, 261 



Organic growth, 5 j Plasm, 10 



Organism, unity of, as regards Plasmogen, 10 

 body and germ, 161 ; relation Platyglossus, 83 

 of, to environment. 183 > Play, instinct of, 450 



Organization, co-ordinating Pleasure and the special senses, 

 power of, 125 ; of bodily and 243 ; massive and acute, 379 ; 

 mental activities, 419 capacities of animals for, 391 



Origin, distinguished from guid- Plecotus auritt, 



Plesiosaurus, pineal eye of, 288 

 PLOSS, Herr, on sex-differentia- 

 tion in man, 59 



ance, 242 



Origin of species, 242 

 Origin of organic variations, 231 ; 



of metakinetic or mental varia- Plover, Kentish, 83, 217 



tions, 496 I Polar cells, extrusion of, 51 ; and 



Ornithoptera. 179 variation. 153 



Otoliths, 265, 271 Postponement of action, 385 



OWEN, Sir Richard, suggested POULTON, Mr. E. B., on colours 



germinal continuity, 135 | of animals, 84 ; on Phrynoce- 



of superabundant food on, 394 



RAK, Dr., on dogs swimming 

 rivers, 364; on "abstract 

 reasoning " in the fox, 366 ; on 

 wild and tame ducklings, 435 



Rage and anger, 389 



RAMSAY, Dr. Wm., on smell, 255 



Rats of Solomon Islands, 100; 

 of the London Docks, 106 ; at 

 South Kensington, 115 



RAYLEIGH, Lord, on colour-blend- 

 ing. 283; on sensitive-flame 

 experiments, 298 ; 



Reality, meaning of term, 314 



Reason distinguished from intel- 

 ligence, 330, 365; as defined 

 by Mr. Romanes, 372 



Recepts, 326, 368 



Kecognition-marks, 103; involve 

 perception, 351 



Reconstructs and reconstruction 

 (mental;, 318 



