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A study of spermatogenesis was made on four groups of a pedigreed strain of the moth Philosamia cynthia, and the results were compared with spermatogenesis in the wild material. Deviations… (More)
The following is a record of the results obtained by compressing the eggs of Cerebratulus lactews" during maturation and early cleavage stages. The material is excellent for this purpose, since… (More)