INDEX OF SUBJECTS 



Protoplasmic structure, theories of, 59 

 Protoplasmic system as life-unit, 37 

 Protozoa, 33, 36, 358 



ectoplasm in, 87. 88 

 Psammechinus, egg of, 57 

 Pseudopodia, ectoplasmic, 81, 82-85, 

 89, 103 



r~\ 



Q 



Quantitative biology, 3, 5, 25, 238 



R 



Radiations as experimental means, 348 

 Radium, 341 

 Red blood cells, 86 



Red blood corpuscles, 36, 54, 71, 119 

 Refractive index, 44 

 Regeneration, 248, 320 

 Reptiles, ectoplasm in eggs of, loi 

 Resistance and susceptibility in cell- 

 division, 272 

 Respiration, 358, 359 

 Resting nucleus, 51 

 Rhabditis, egg of, 180, 181, 206 

 Rhynchelmis, egg of, 97 

 Roentgen-rays, 341, 349 

 Rotifera, ectoplasm in eggs of, 93 



Sahellaria, egg of, 102 



Saccocirrus, egg of, 187 



Sagitla, egg of, 153 



Salinity, effect of changes In, 340 



Sciara, egg of, 351 



Sea-urchin, skeleton of larva of, nor- 

 mal variation, 21 



Segmented worms, ectoplasm in eggs 

 of, 96 



Selachians, ectoplasm in eggs of, 100 



Self-differentiation, 9, 309 



Self-fertilization, 155 



Self-regulation, 9, 104, 238 364 



Semi-permeability, 139-146 



Sex-differentiation, 329 



Somatic cells, 147 



Specific gravity, 44 



Specificity. 41 



Specificity in fertilization, 197-198, 



2C4 



Sperm-amphiaster, 167 

 Sperm-aster, 163 

 Spermatozoa, origin of, 149 



structure of, 151 

 Spermatozoon, middle-piece of, 171 ff. 



of Ascaris, 152 



of Cerebratulus, 151 



of Nereis, 1 5 1 

 Sperm-centrosome, 163 

 Sperm-nucleus, 163 

 Sperm-rotation, 162, 172 

 Spindle-threads, 69 

 Sponge, ectoplasm in egg of, 89 

 Starfish, egg of, 154 

 Strongylocentroius, egg of. 106, 192, 



304, 30s 



Sub-normal eggs in experiment, 19 



Surface-cytoplasm, 8 



Surface-tension, 283 



in cell-division, 270 ff. 



Susceptibility during membrane-sepa- 

 ration, 109 ff., 282 



Synaptic membrane, yj, 120 



Syncytia, 33 



T 



Teleosts, ectoplasm of eggs of, loi 

 Temperature, as experimental means, 

 20, 218 



effect of change in, on eggs, 340 

 Thalassema, egg of, 97, 153, 223 

 Thysanosoon, egg of, 153 

 Tissue-culture, cause of migration of 

 cells in, 85-86 



cells in, 252 



ectoplasm in cells in, 83-86 

 Tissues, behavior of, under laboratory 



conditions, 18 

 Trematode eggs, 183, 305 

 Trophoblast, 302 

 Tubifex, egg of, 317 

 Tumors, 43, 249, 320 



U 



Ultra-centrifuge, 39 

 Ultra-filterable viruses, 32 



301 



