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The appearance of Boveri’s Recent remarkable paper 1 on the analysis of the nucleus by means of observations on double-fertilized eggs has prompted me to make a preliminary communication of certain results obtained in a general study of the germ-cells of the great “lubber grasshopper,” Brachystola magna. As will appear from a glance at the figures given in my former paper 2 upon the same form, the cells of Brachystola, like those of many amphibia, selachians and insects and certain of the flowering plants, exhibit a chromosome group, the members of which show distinct differences in size. Accordingly, one feature of this later study has been a critical examination of large numbers of dividing cells (mainly from the testis) in order to determine whether, as has usually been taken for granted, these differences are merely a matter of chance, or whether, in accordance with the view recently expressed by Montgomery, 3 in regard to a certain pair of elements in the nuclei of one of the Hemiptera, characteristic size-relations are a constant attribute of the chromosomes individually considered. With the aid of camera drawings of the chromosome group in the various cell-generations, I will give below a brief account of the evidence which has led me to adopt the latter conclusion. 1 Boveri,Th. (1902),“Mehrpolige Mitosenals Mittel zur Analyse des Zellkerns,” Verh. d. Phys. Med. Ges. zu Würzburg, XXXV. 2 Sutton, W. S. (1900), “The Spermatogonial Divisions in Brachystola magna,” Kans. Univ. Quart., Vol. 9. 3 Montgomery, T. H., Jr. (1901), “A Study of the Chromosomes of the Germ Cells of the Metazoa,” Trans. Amer. Phil. Soc., Vol. XX.

On the morphology of the chromosome group in Brachystola magna