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16
THE POPULAR SCIENCE MONTHLY
impression that he supposes the determinants of the chromosomes to pass out into the cell, multiply there, and become the differentiated part. Perhaps this is only due to his attempt to visualize his conception, and he might grant that the differentiation of the determinants may depend on the interaction of many parts of the cell. But if we take his view literally to mean that the determinants are the materials out of which specific structures are directly built up, then his conception of the nature of a determinant is widely different from my own concerning the relation of "factors" and body characters.
