Abstract
In my study of the development of the behavior of Amblystoma it became imperative to know whether or not eggs or embryos that had been subjected to a low temperature, in order to prolong the experimental season by retarding growth, followed the normal order of development of movements. To meet this requirement I conducted experiments in 1930. Regarding behavior the results were conclusively in the negative, but it seemed desirable to vary the conditions in further experiments before publishing the results, especially in consideration of the numerous and extreme structural defects that appeared in the experimental animals. But inasmuch as I have not been able, and probably shall not be, to repeat the experiments the most obvious results are here presented on account of their bearing on experimental morphology. The work was done in the biological laboratory of the Effingham B. Morris Biological Farm of the Wistar Institute of Anatomy and Biology. The special advantages of this laboratory are gratefully ackn...
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