Index 



269 



Petals, increase of, 20. 



PFEFFER, 149, 157. 



PFLUGER, 41. 



Phaseolus multiflorus, 180, 181 ; 

 vulgaris nanus, 180. 



Physiological units, 51. 



Plasma-membrane, 42. 



Plasson, 45. 



Plastidules, 44, 46. 



PLATNER, 163. 



Poa nemoralis, 119. 



Polyps, colony- forming, 94. 



Polysiphonia, 208. 



Potato, 15. 



Primula acaulis var. caulescent, 

 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, 37, 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, 73. 



Reproduction, significance of 



sexual, 247, 248, 263. 

 Rheum, 106. 

 RIMPARA, 22, 222. 

 ROBINSON, Miss, 14. 

 Rock-roses, 261. 

 Raphanus sativus, 182. 

 Roses, Alpine, 260. 

 Roux, 178, 201, 230. 

 RUCKERT, 228. 

 . Rumex 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. 

 Saprolegniaceae, 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. 

 Siphonocladiaceae, 145, 187. 

 Slredon, 229. 



Somatic tracks, 89, 100, 103, 105. 

 Species, how originate, 256. 



