INDEX OF SUBJECTS 



345 



Organ-forming substances, 233. 

 Organization of egg, 19, 29, 228/. 

 Oxyphile, 11. 



Pachytene, 252. 

 Psedogenesis, 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. 

 Peden, 191. 

 Pennaria, 87. 

 Peripatus, 285, 288. 

 Petromyzon, 33. 

 Phallusia, 233. 

 Phosphatid, 8, 12. 

 Phylloxera, 265 /. 

 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 (see 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. 

 Polychoerus, 157. 

 Polyembryony, 145/., 161. 

 Polyp, 23. 

 Polyphemus, 170/., 236. 



Polyspermy, 48, 115, 299. 

 Porifera, 69 /. 



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, 43, 



253. 

 Regeneration, 79-80, 297. 

 Reproduction, 17-18. 

 Rotifera, 186. 

 Rhahditis, 267, 270. 

 Richtungscopulationskern, 144. 



Sagitta, 179 #., 195, 228. 



Salamandra, 134. 



Sarcode, 3. 



Scorpoena, 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 /. 



Sex determination, 274. 



Sol, 5, 6, 9. 



Sorite, 76, 79. 



