INDEX 



233 



Species, transformation of, 224. 



Speck, 6. 



Spemann, 215. 



Spermatozoa, stereotropism of, 156. 



specific nature of, 162, 163. 



effect of alkali on, 163. 



nature of action, 176, 178. 

 Spiro, q6. 

 Spirographis, 122. 

 Spitzer, 15. 

 Starling, 34. 



Starvation, effect on Planarians, 221. 

 Stereochemistry and enzyme action, 24. 

 Stereotropism, 155 ff. 



in spermatozoa of Periplanata, 156. 



in Tubular ia, 156. 



in Amphipyra, 157. 



in worms, 157. 

 Stevens, Miss, 206. 

 Stimulation, 98, 105, 180. 

 Stoklasa, 22. 

 Strassburger, 130. 

 Streaming phenomena, 65, 204. 

 Strongylocentrotus eggs, fertilization imi- 

 tated artificially, 2, 167 ff. 



structure of, 31. 



effect of electrolytes on development 



of 75- 

 effect of NaHCOs on development 



of, 75, 97- 

 fertilized with starfish sperm, 162. 



Surface films, 32, 38. 

 Surface tension, 55. 



in protoplasmic motion, 55. 



in muscular contraction, 57. 



in fertilization process, 163. 



Taylor, 9, 10. 



Temperature, upper limit of life, 106. 



coagulation of proteids, 107. 



effect on reaction velocity, 108. 



effect on CO* production, 108. 



effect on rate of heartbeat, 109. 



effect on development of frog's 

 eggs, i TO. 



lower limit of life, no. 



other biological effects, 112. 



effect on heliotropism, 131. 

 Tetanus toxin, 216. 



Thalassema, 174. 



The'nard, 8. 



Thigmotropism, 155. 



Thyroid gland, 216. 



Tichomiroff, 165. 



Towle, Miss, 134. 



Transfusion of blood, 182. 



Traube, 13, 24, 33, 38, 45. 



Traube's artificial membranes, 39. 



Troptzolum, 199. 



Tropisms, 5. 



theory of, 138. 

 Tschagovetz, 69. 

 Tschermak, 183. 



Tubularia, necessity of oxygen in regen- 

 eration, 17. 



influence of bicarbonates on, 96. 



stereotropism of, 156. 



regeneration in, 202. 



polarity in, 202. 



heteromorphosis, 203. 

 Turgidity in tentacles of Cerianthus, 208. 

 Twins, 186. 



Verworn, 142. 



Vogel, 113, 114. 



Volta, 68. 



De Vries, 3, 183, 186, 224, 225. 



Waller, 68, 70. 



Warburg, 101. 



Whitman, 197. 



Wild, 14. 



Willow twig, regeneration in, 207. 



Wilson, 32, 178, 189, 192, 196, 216. 



Winkler, 175. 



Winter eggs, 187. 



Woehler, 7. 



Wortmann, 119. 



Yeast, 12. 

 Young, 21. 



Von Zeynek, 101. 



Zinc, in nutrient solution for Aspergil- 



lus, 73. 



Zoethout, 84, 86. 

 Zur Strassen, 194. 

 Zymase, 21. 



