The first principles of heredity; with 75 illustrations and diagrms . can sometimes be seen to must therefore be a still higher unit than the Id,the Chromosome, or, as Weismann has called it, in con-formity with his nomenclature, the Idant. We see,therefore, that each germ-cell having many Idants (chromo-somes), each consisting of a number of Ids, contains therepresentative units of many individuals ; each single Id,with its determinants, standing for a complete individual. The idioplasm which is contained in the germ-cell hasbeen specially named by Weismann the germ-plasm. Itcom
The first principles of heredity; with 75 illustrations and diagrms . can sometimes be seen to must therefore be a still higher unit than the Id,the Chromosome, or, as Weismann has called it, in con-formity with his nomenclature, the Idant. We see,therefore, that each germ-cell having many Idants (chromo-somes), each consisting of a number of Ids, contains therepresentative units of many individuals ; each single Id,with its determinants, standing for a complete individual. The idioplasm which is contained in the germ-cell hasbeen specially named by Weismann the germ-plasm. Itcomprises, as has been seen, the constituents for the con-struction of the new being. Weismann holds it as anuncontroverted fact that the body-cells cannot, as, for THEORIES OF HEREDITY 59 instance, Darwin still held, reproduce the the body-cells of the new organism are formed, theyare specialized and incapable of assuming the function ofgerm-cells, simply because, as we shall see presently, theydo not any longer contain all the determinants necessary.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1910
