470 



INDEX 



Phytoprecipitins, 317 

 Pin-worm, 354 



Plague serum of Haffkine, 399 

 Planaria. regeneration in, 404 

 Plant cells, 97 



parasites, 346 



parasitism, 334 

 Plantade, 212 

 Plants and electric currents, 60 



cell wall of, 100 



classification of, 311 



conductivity in, 69 



effect of light on, 56 



fertilization by insects, 200 



geotropic reactions of, 64 



grafting in, 438 



regeneration in, 417 



reproduction in, 199 

 Plasmodia, 98, 112 

 Plasmodium malariir, 339, 358 

 Plenciz, 24 



Plett and vaccination, 392 

 Poisons, 46 



reactions to, 374 



tolerance of, 372 

 Polar bodies, 208 



field, 105 

 Polioplasm, 95 



Polydactylism, a Mendelian char- 

 acteristic, 273 

 Polyembryony, 217, 218 



accidental, 218 

 Precipitation, 317, 318 



specific, neasurement of, 319 

 Precipitins in blood relation- 

 ship, 318 



Preformat ion theory. 212 

 Prevost, 214 

 Primitive groove, 224 



streak, 224 

 Proglottides, 363 

 Pronucleus, 208 

 Prophase, 102 

 Proprioceptors, 152 

 Proskauer, 87 

 Protandrism, 195 

 Protandry, 199 

 Protein, 84 

 Prothallium, 198 

 Protogyny, 200 

 Protophyta, 93 

 Protoplasm, 19, 31, 84 



Protoplasm, electric stimulation 

 of, 61 



elements of, 87 



of the cell, 95 



thermal irritability of, 40 

 Protozoa, 93 

 Pseudopodia, 75 

 Pseudopods, 126 

 Psychology, 179 

 Pyrenin, 98 



QUARTER evil, vaccine for, 396 



RABIES, Pasteur treatment of, 



396 



Radiolaria, structure of, 112 

 Rauber on fertilization, 259 

 RauUn, 87 

 Reason, 176 

 Receptor, 152, 153 

 Receptors, 381 



types of, 152 

 Recessive characters, 270 

 Recipients, universal, in blood 



transfusion, 324 

 Redi, 22 

 Reduction division, 206. 207 



of chromosomes, 204 

 Reflex, 153 



action, 46, 150, 153, 170 

 compound, 169 

 definition of, 167 

 elements of, 152 

 mechanism of, 173, 176 



arc, 152, 153 



circuit, 152, 153 

 types of, 154 



nervous action, mechanism of, 



173 

 Regeneration, 401 



influences governing, 410 



in plants, 417 



of blood-vessels, 412 



of bone, 413 



of epithelial tissue, 412 



of muscular tissue, 414 



of nervous tissue, 414 



of viscera, 415 

 Reichert and Brown on blood 



relationship, 321 



