Index 



269 



Petals, increase of, 20. 



Pfeffer, 149, 157. 



Pfluger, 41. 



Phuscoliis multiflonis, 180, 181 ; 

 vulgaris nanus, 180. 



Physiological units, 51. 



Plasma-membrane, 42. 



Plasson, 45. 



Plastidules, 44, 46. 



Platner, 163. 



f^oa nemoralis, 119. 



Polyps, colony-forming, 94. 



Polysiphonia, 208. 



Potato, 15. 



Primula acaulis var. caulescens, 

 23, 60. 



Primulaceae, 18. 



Principles of Biology, 51. 



Pringsheim, 96, 104, 164, 186, 

 187, 189. 



Pronuclei, 228. 



Propagation, asexual, 247. 



Protein and protoplasm, 41 ; ar- 

 tificial synthesis of, 43; living, 

 41. 



Prothallium, 236. 



Protomyces macrosporus, 164. 



Protoplasm, 41, 125, 126; arti- 

 ficial synthesis of, 43 ; com- 

 posed of pangens, Z7, 43, 195, 

 197, 216; currents in, 205, 216. 



Protoplasts, 125 ; connection of, 

 208; regeneration of, 139. 



Pseudosomatic tracks, 100. 



Pyrenoids, 149. 



Races, how improved, 31, 32. 



Reduction of chromosomes, 237. 



Reduction-division, 240. 



Rees, 85. 



Regel, 98, 99. 



Regeneration, 95, 139, 143. 



Rejuvenation, 99. 



Relationship, systematic, 72). 



Reproduction, significance of 



sexual, 247, 248, 263. 

 Rheum, 106. 

 Rim PARA, 22, 222. 

 Robinson, Miss, 14. 

 Rock-roses, 261. 

 Raphanus sativus, 182. 



Roses, Alpine, 260. 



Roux, 178, 201, 230. 



RiJCKERT, 228. 



Rum ex Acetosella, 16, 98. 



Russow, 209. 



Sachs, 70, 81, 85, 99, 115, 129, 



134, 143, 147, 150, 151, 174. 

 Sagitta, 94. 



Sagiura, Shigetake, 39. 

 Salamander, 231. 

 Salix, 258; purpurea, 119. 

 Salvia, 260. 

 Saprolegnlaceae, 164, 

 Sarracenia purpurea, 14. 

 SCHACHT, 174. 



Schimper, 14, 130, 145, 156, 186. 



Schleiden, 79. 



Schmidt, 143. 



Schwann, 79, 114. 



ScHMiDTz, 102, 129, 145, 148, 150, 



173, 175, 176, 187. 

 Schwendener, 143. 

 Scytosiphon lomentarium, 176. 

 Sea-urchins, 200, 235. 

 Selenka, 169. 

 Self-fertilization, 29, 30. 

 Sempervirum tectorum, 20. 

 Sexual characters, secondary, 18. 

 Shull, 256. 

 Sinety, 238. 

 Siphoneae, 143. 

 Siphonocladiacese, 145, 187, 

 Sire don, 229. 



Somatic tracks, 89, 100, 103, 105. 

 Species, how originate, 256. 



