1. Narcosis of the unfertilized Oryzias eggs with chloretone brings about reversible inhibition to fertilization reaction. 2. Narcosis of the unfertilized eggs with phenyl urethane or chloretone gives rise to the inhibition of activation on mechanical (pricking), chemical and thermal stimulation. 3. When the narcosis is not complete, partial cortical response occurs which begins near the animal pole and the vegetal pole.
