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Cytological studies have shown that in the maturation divisions of a large number of species of animals the cells which are to give riseto the spermatozoa are of two kinds, differing from each other in the nature of their chromatin content. The resulting spermatozoa therefore are assumed to be likewise of two kinds. A large mass of indirect evidence makes it highly probable that eggs fertilized by one of these produce only males and those fertilized by the other only females.

Dimorphism in Size of Spermatozoa and its Relation to the Chromosomes