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Physical and Chemical Changes in the
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abnormal acid antipolar antipole appears Arbacia Arch archenteron artificial parthenogenesis ascidian aster axis become bilateral Biol blastomeres blastopore blastula Boveri cells centrifuged eggs Cerebratulus changes chromosomes cleavage plane compressed cytoplasm determined diploid divide division dorsal lip Echinus ectoderm ectoplasm egg-nucleus embryo endoderm enter Entw.-Mech evidence experiments female fertilization fertilizin formation fragments frog's egg gastrula genes gray crescent half haploid hemisphere Hertwig hybrid isolated blastomeres jelly Jour larvae later layer Lillie Loeb material median plane membrane mesoderm micromeres minutes Morgan neural plate normal egg normal embryo notochord nuclear nucleus number of chromosomes observed parthenogenesis Physiol pigment plutei polar body pole position posterior present produce protoplasm region right angles sea water sea-urchin eggs second cleavage segmentation self-fertilization shown in Fig side species Spemann sperm sperm-nucleus spermatozoa Sphaerechinus stage Strongylocentrotus studied substance surface takes place tion Triton tube Ueber unfertilized eggs whole embryo yolk