INDEX OF 
Organ-forming substances, 233. 
Organization of egg, 19, 29, 228 ff. 
Oxyphile, 11. 
Pachytene, 252. 
Peedogenesis, 18, 52. 
Paracopulationszelle, 212, 225. 
Paramecium, 27. 
Paranucleus, 163. 
Paraplasm, 7. 
Parasitism, 191-192. 
Parasynapsis, 254. 
Parthenogenesis, 18, 47, 145, 246, 
265. 
Pea, 302, 303. 
Pecten, 191. 
Pennaria, 87. 
Peripatus, 285, 288. 
Petromyzon, 33. 
Phallusia, 233. 
Phosphatid, 8, 12. 
Phylloxera, 265 ff. 
Physa, 186, 225. 
Pig, 194. 
Planocera, 157. 
Planorbis, 186. 
Plasmodia, artificial, 77-78. 
Plasmosome, 5, 7, 102, 103, 213. 
Plastid, 5, 7. 
Plastochondria, 279. 
Plastokonta, 279. 
Plastosome, 7, 244, 275, 279. 
Polar body, 47, 143-144. 
Polares Plasma (sce pole-plasm). 
Polarity, 19, 107, 124, 179, 231 ff. 
Pole-cell, 110, 111, 117. 
Pole-disc, 109, 114, 117, 142, 219, 
225, 229, 235. 
Pole-plasm, 53-55, 228, 230, 235, 
294-295. 
Polistes, 222. 
Polycherus, 157. 
Polyembryony, 145 ff., 161. 
Polyp, 23. 
Polyphemus, 170 ff., 236. 
x 
SUBJECTS 345 
Polyspermy, 48, 115, 299. 
Porifera, 69 ff. 
Potato beetle (see Leptinotarsa). 
Preblastodermic nuclei, 114. 
Predetermination, 2. 
Preformation, 2, 243. 
Prochromosome, 299. 
Progerminative cell, 196, 197. 
Promorphology, 19. 
Prophase, 14. 
Protandry, 193. 
Protein, 8, 10. 
Protenor, 123, 258. 
Protogyny, 192-193. 
Protoplasm, 3-13. 
Protozoa, 1, 17, 25. 
Pteropod, 269, 271. 
Pupa, 23. 
Pyrrhocoris, 256. 
Rana, 32. 
Recessive character, 304. 
Reduction of chromosomes, 
253. 
Regeneration, 79-80, 297. 
Reproduction, 17-18. 
Rotifera, 186. 
Rhabditis, 267, 270. 
Richtungscopulationskern, 144. 
43, 
Sagitta, 179 ff., 195, 228. 
Salamandra, 134. 
Sarcode, 3. 
Scorpena, 222. 
Sea urchin, 216. 
Secondary sex characters, 189. 
Segregation of germ cells, 29. 
Self-copulation, 192. 
Self-fertilization, 192. 
Sertoli cell, 35, 129-133. 
Sex, 18, 189. 
Sex chromosome, 255 ff. 
Sex determination, 274. 
Sol, 5, 6, 9. 
Sorite, 76, 79. 
