INDEX 



471 



Priestley, 398 



Primary cylinder, 76 



Primates, 358, 416 



Pronephric duct, 179 



Pronephros, 179 



Pronuclei, 241 



Prophase, 225 



Prosencephalon, 187, 188 



Prostomium, 123 



Proteins, 12, 14, 36, 42, 87, 157 



Proterozoic era, 358 



Prothallus, 103, 104 



Protista, 214, 216; fertilization 

 in, 243-248 



Protohippus, 361, 862 



Protonema, 101, 102 



Protophyta, 39, 214 



Protoplasm, 4, 7-10, 19; alveolar 

 structure, 10; appearance, 8; 

 chemical composition, 11; con- 

 cept, 400; and environment, 

 9, 17 



Protoplast, 31 



Protopodite, 132 



Protozoa, 39, 116, 214; classifica- 

 tion, 414; discovery, 388; fer- 

 tilization in, 335 ; malarial para- 

 site, 335; maturation in, 233 

 (see Paramecium) 



Pseudopodium, 9 



Psychology, 4 



Psychozoic era, 358 



Pteridophyta, 103, 112, 414 



Pubis, 144, 14$, 354 



Pulmonary artery and vein, 150- 

 153, 165, 171, 172 



Pulvillus, 328 



Pupil, 201 



Pure lines, 300, 302-306; versus 

 population, 300, 305 



Purkinje, 7 



Pyloric, caecum, 148; valve, 156 



Python, 355 



R 



Rabbits, Porto Santo, 369 



Radial symmetry, 118 



Radius, 144 



Rana, 149 (see Frog) 



Ray, 390 



Reaumur, 395 



Recapitulation theory, 364, 403 



Receptor-effector system, 183, 184 



Receptor, external, 193; internal, 

 193 (see Sense organs) 



Recessive character (see Charac- 

 ter) 



Recombinations, 268 



Rectum, 155 



Redi, 210, 388 



Reducing division, 231 (see Oogen- 

 esis and Spermatogenesis) 



Reduction, 228, 229 



Reflex action, 193 



Reflex arc, 184 



Reflexes, 342 



Regeneration, 217; in Crayfish, 

 Earthworm, Flat worm, Para- 

 mecium, Salamander, Snail, 

 221; and grafting in Hydra, 221 



Rejuvenation, 244 



Renaissance science, 346, 384-386 



Renal artery, 180 



Renal portal system, 164, 165, 167 



Reproduction, 11, 17, 212-222; 

 in animals, 203-208; asexual, 

 113; biparental, 54; versus 

 fertilization, 243, 251; in plants, 

 91-114; uniparental, 54 



Reproductive organs, 98-100; 

 Crayfish, 131; Earthworm, 204; 

 Hydra, 204; system, 116; evo- 

 lution of, 179, 208, 365; Verte- 

 brate, 137, 148-152 



Reptile, 117, 136; versus Bird, 

 359; brain, 189; dissection of, 

 150 



