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- W2289756901 abstract "While studying the unfertilized egg of Arnphilrile at the Ma rine Biological Laboratory, Wood's Holl, Mass., I verified Fisch er's' result that the eggs could be caused to develop cilia by squirting them from a pipette, by transferring them from one dish to another, or by some other sort of mechanical agitation. I be lieve however that it is inadmissible to speak of this development as parthenogenesis, meaning the production of a normal embryo from an unfertilized egg. Ciliated, swimming structures result, but their differentiation takes place with only partial or abnormal and usually without any definite segmentation. I will discuss the morphology of these processes in another paper. Lillie2 has shown clearly a similar differentiation in the Chattoplerus egg. In addition to Fischer's results, I found: (i) At least two criti cal periods in which the egg is highly susceptible to mechanical stimulation, one period thirty to forty-five minutes, the other eighty to one hundred minutes after they are removed from the body and placed in sea-water; (2) slight agitation is more effec tive in the second period than in the first; rougher handling is betterinthe firsthan inthesecond inwhich theeggs aremore easily broken into fragments. (3) Frequent and moderate squirting after thirty to fifty minutes seems more effective than one hard squirting after the same time. In my early experiments with certain salt solutions, the results were sometimes discrepant, and there was great variableness in the number of swimming eggs obtained under apparently identi cal conditions. About this time Fischer's paper came into my hands. He had shown that “? parthenogenetic development can be produced by adding a small amount of Ca-salt to sea-water―" @default.
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- W2289756901 date "1903-06-01" @default.
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- W2289756901 title "PERIODS OF SUSCEPTIBILITY IN THE DIFFERENTIATION OF UNFERTILIZED EGGS OF AMPHITRITE" @default.
- W2289756901 doi "https://doi.org/10.2307/1535826" @default.
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