Spermatogenesis in Spiders and the Chromosome Hypothesis of Heredity

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REFERRING to several letters which have appeared in NATURE (September 12, October 3, October 17) on the Spermatogenesis of spiders, I have now examined the testes of a number of South African spiders, and it is found that the chromatin behaviour and the absolute dimensions of the spermatogonia and spermatocytes may differ extraordinarily in different species, even when these species are not far removed systematically from one another.

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