INDEX 



581 



Portal system, 59. 



Portuguese man-of-war, 277, 278. 



Potamobiiis, 322. 



Pouchet, 204. 



Preformation, 418, 436. 



Prenatal influence, 449. 



Primates, 528, 532. 



Proboscis, 312. 



Proctodaeum, of frog, 411, 414. 



Promorphology, of zygote, 403, 405, 



418. 

 Pronucleus, 233. 

 Prophase, 137. 

 Prorodon, 176, 189. 

 Prostomium, 283, 302, 312. 

 Protein, 74; digestion of, 82, 85. 

 Protoplasm, 71, 132, 490; chemical 



nature of, 73; physical nature of, 



71. 

 Protopodite, 326. 

 Protopterus annectens, 46. 

 Protozoa, cell cycle of, 213, 215; 



classification of, 153, 237, 240. 241; 



colonial, 195, 196, 197, 198; 



general problems related to, 195; 



irritability of, 192; metabolism of, 



192; parasitic, 175; in relation to 



disease, 206; reproduction of, 193; 



vs. metazoa, 195. 

 Protozoology, 209. 

 Proventriculus, 354. 

 Proximo-distal differentiation, 244. 

 Punnett, 479. 

 Pupa, 380, 381. 

 Pure line, 459, 461, 486, 559. 

 Purkinje, 132. 

 Pseudopodia, 154. 

 Psychology, 3. 

 Ptyalin, 82. 



Quetelet, 458. 



Radial symmetry, 243, 249. 



Radiolaria, 165. 



RaTia catesbiana, 12, 15, 415. 



Rana clamitans, 12, 15. 



Rana fusca, 54. 



Rana palusiris, 12, 16. 



Rana pipiens, 12, 16, 21. 



Rana sylvatica, 12, 16. 



Ranidae, 12. 



Ration, see Diet. 



Recapitulation Theory, 503. 



Receptor-adjustor-effector system, 



316, 318. 

 Receptor-effector system, 317. 

 Receptors, 108, 124, 269, 299, 317; 



see also Sense organs. 

 Recessiveness, in inheritance, 464. 

 Rectum, of locust, 354. 

 Redi, 202, 222. 



Red-legged locust, see Melanoplus. 

 Reflex action, 107, 319. 

 Reflex arc, 107, 109, 112, 298, 319. 

 Reflexes, allied. 111; antagonistic, 



111; chain. 111; compound, 111; 



conditioned, 112; pattern and order 



of, 113; simple, 107. 

 Regeneration, 273. 

 Renal portal system, 59. 

 Rennin, 82. 

 Reproduction, 76, 129, 193, 213; of 



Amoeba, 163; asexual, 214, 218, 



219; and development, 218; of 



earthworm, 305; of Euglena, 174; 



of Hydra, 270; of locust, 369; 



modes of, 219; of Paramoecium, 



184; sexual, 184. 214, 219; sum- 

 mary of, 235. 

 Reproductive organs, of earthworm, 



290, 295, 296; endocrincs of, 102; 



of frog, 47, 54, 400, 416; of Hydra, 



270; of locust, 357, 358. 

 Reptilia, 10; classification of, 37, 241; 



development of, 422; environment 



of, 28. 

 Respiration, 91; external, 92; of 



Hydra, 262; internal, 93, 162; of 



Protozoa, 162, 184. 

 Respiratory system, of locust, 355; 



of vertebrates, 62, 91. 

 Retina, 123. 

 Rhabdias, 22. 

 Rhizopoda, 154, 164. 

 von Rosenhof, 258. 

 Rostrum, 322. 



