Initiation of development in Arbacia

摘要: 1. Eggs of optimum fertilization capacity exhibit high fertilizin content and separate membranes uniformly rapidly after insemina tion. Uninseminated, such eggs in five seconds tap or distilled water; they form extra-ovates thirty when exposed to water three minutes insemination. All these reactions are associated with the best physiological condition egg. 2. Under proper conditions, without jelly fertilize, separating normal membranes. They develop at well as jelly. 3. The speed fertilization-reaction is so great that polyspermy cannot be induced by any excess sperm. Nevertheless, may chemical nature. 4. These results serve emphasize anew leading role played cortex fertilization-reaction. 5. The egg significant other ways for physio logy development.