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概要

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• 1. When transected pieces of embryos ranging in age from 2 to 6 days are transplanted to the chorio-allantoic. membrane of older embryos, fusion of feather primordia is commonly observed. Fusion occurs by twos, threes, and more of them, the first cases being the most abundant. 2. Frequency of occurrence of fused feather primordia decreases as the age of donors increases. This shows that some changes that may be referred to the plasticity are going on in the course of ages. 3. Cases in which the fusion of two feather primordia occurs can be classified into four types according to their grade of union. Some representative examples of these are described. 4. Some adequate examples, in which the regular arrangement of barbule primordia is maintained, give a hint as to the analysis of fusing processes. In the fusion and regulation of feather primordia, the part which is played by the law of the least surface appears to be of prime importance.

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著者

• 久米 又三

  Zoological Laboratory Faculty Of Science Ochanomizu University

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