Index of Subjects 



B 



Agglutination of spermatozoa, 196 

 Ah'eolar theory of cytoplasmic struc- 

 ture, 59-63 

 Amia, egg of, 301 

 Amino-acids, 39 

 Amitosis, 250, 266 



Amoeboid changes in eggs, 89, 93, 108 

 Amoeboid movements, 87 



of nerve-cells, 82-85 

 Amphibians, ectoplasm of eggs of, 99 

 Aynphioxus, ectoplasm of egg of, 99 



egg of, 153, 177, 201, 266, 302 



fertilization in egg of, 167-170 



Anastral mitotic figure, 266 



Arbacia, egg of, 23, 48, 64, 108, 112, 



116, 117, 126, 127, 173, 187, 



192, 200, 201, 222, 224, 233, 



269, 274, 27s, 277, 303, 336 



fertilization in egg of, 170-171 



spermatozoa of, 104 

 Arthropods, ectoplasm in eggs of, 98 

 Ascaris, egg of, 49, 153, 266 

 Asexual reproduction, 319 

 Asteracanthion, egg of, 213, 214 

 Asterias, egg of, 186, 188, 201, 212, 



213, 214, 215, 337 

 Asters in cell-division, 255 



of first cleavage, 182 

 Astral fibres, 69, 215 



rays, 69 

 Astropecten, egg of, 215 

 Asynchrony of nuclear and cyto- 

 plasmic division, 266 

 Autolytus varians, eggs of, 57 

 Axial gradient, 301 

 Axis of embryo, 300 



Bacteria, 31, 32, 35 



ectoplasm in, 88 

 Bacterium, 8 

 Beroe, egg of, 91 

 Bilaterality, 301 

 Biogen-molecule, 5 

 Biological system, 17 

 Biologists, physico-chemical, 14 

 Biology, '"physico-chemical," 11 

 Birds, ectoplasm of eggs of, loi 

 Blastomeres, movement of, 335 

 Blastula, 301 

 Blue-green algae, 31, 32 

 Body-fluid, role of, in fertilization, 



196, 198 

 Bonellia, egg of, 97 

 Brain, development of, 366 

 Butyric acid, in experimental partheno- 

 genesis, 213, 222 



Cancer, 345-346, 365 

 Capillary spaces, 298, 344 

 Carbohydrates, 40 



Carbon-dioxide, means for experi- 

 mental parthenogenesis, 212 

 Cell, 35 



chemical composition of, 38 ff. 



forms of, 37 



size-variations of, 37 

 Cell-division, change in shape of 

 echinid egg during, 272 



definition of, 267 



in egg of Arabacia, 255 ff. 



in sea-urchin eggs, 253 ff. 



3^"^: 



