INDEX OF SUBJECTS 



Dilute sea-water, unfertilized eggs in, 

 126 



Dinophilus, egg of, 187 

 Drosophila, 321, 328 



Echinarachnius, egg of, 57, 69, 106, 

 108, 109, 115, 116, 126, 173, 

 181, 187, 192, 199, 201, 222, 



254, 273 

 fertilization in egg of, 171-177 

 Echinocardium, egg of, 192 

 Echinoderms, ectoplasm in eggs of, 



93-96 

 Echinus, eggs of, 106, 192 

 Ectoderm, 122, 288, 366 

 Ectoplasm, 8 



defined, 75 



in bacteria, 88 



in cells in tissue-culture, 83-86 



in cells of multicellular organisms, 



76 

 in eggs, 89 ff. 



of amphibians, loi 



of Jmphioxus, 99 



of arthropods, 98 



of birds, loi 



of Cerebratulus, 93 



of Coelenterata, 90 



of echinoderms, 93-96 



of flatworms, 92 



of insects, 98 



of lamprey, 1 00 



of Lingula, 93 



of mammals, loi 



of nematodes, 92 



of Phallusia, 98 



of reptiles, loi 



of Rotifera, 93 



of segmented worms, 96 



of selachians, 100 



of sponge, 89 



of teleosts, loi 

 in leucocytes, 86 

 in muscle-cells, 78-81 

 in nerve-cells, 81-85 

 in plant-cells, 88 

 in protozoa, 87, 88 



Ectoplasm, in red blood cells, 86 

 in sponge cells, 75 

 increase of during cleavage, 331- 



332 



necessity of, for fertilization, 

 192-194 



philosophical implications of 

 theory of, 365-366 



relation of, to cell, 9 



relation of, to environment, 9 



role of, in differentiation, 332-339 

 Ectoplasmic changes due to sperm- 

 attachment, 104 

 Ectoplasmic structure of eggs revealed 



experimentally, 101-102 

 Egg, mammalian, 302 

 Egg-cell, 36 



Egg-fragments, development of, 53, 

 180, 297, 307 



diploid, 318 

 Egg-jelly, role of, in fertilization, 19 

 Egg-secretions, effect of, in initiating 



development, 20-21 

 Eggs, centrifuged, 306 



colors of, 57 



ectoplasm in, 89 ft". 

 Electron-supermicroscope, 26 

 Endoderm, 288 

 Endoplasm, 8, 48 



definition of, 76 

 Endoplasmic buds, 192 

 Ensis, egg of, 98 

 Entrance-cone, 177, 178 

 Epiboly, 301 

 Ethics, 367 

 Exoplasm, 75, 88, 89 

 Experiments, control of, 22 



in biology, categories of, 16 



on eggs, 17 



on the living system, 16 



on tissues in vitro and in situ, 19 

 Extra-ovates, 24, 336, 337 



Fertilizability of egg of Amphioxus, 188 

 of Arbacia, 187 

 of Asterias, 186 

 of Fundulus, 189 



3^7 



