A one-page review in Nature of Vernon L. Kellogg's 1908 Stanford publication on heredity in silkworms. It sets Kellogg's breeding experiments beside those of Coutagne and Toyama, and reports that larval characters follow Mendelian inheritance while cocoon characters show many exceptions. The reviewer criticizes the lack of numerical data and probable-error calculations, using the non-adhesive egg character of the Bagdad race as an example.