. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. SOME EXPERIMENTS ON CELL-DIVISION. 271 ing blaslomcres are of equal size. The result is, however, different when the operation is performed in a later stage as we shall see below. Cases A, G and H. The eggs were cut vertically, in an anaphases, parallel to the division plane. The cleavage furrows were formed along the normal planes and the blastomcres were of different sizes one the normal size and the other smaller (Figs. 1, 15-18). Case I. A portion of a blastomere of the two-cell stage was cut at an anaphese of the second cleav
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. SOME EXPERIMENTS ON CELL-DIVISION. 271 ing blaslomcres are of equal size. The result is, however, different when the operation is performed in a later stage as we shall see below. Cases A, G and H. The eggs were cut vertically, in an anaphases, parallel to the division plane. The cleavage furrows were formed along the normal planes and the blastomcres were of different sizes one the normal size and the other smaller (Figs. 1, 15-18). Case I. A portion of a blastomere of the two-cell stage was cut at an anaphese of the second cleavage (Fig. 19). The operated blastomere divided unequally, the result being three of the normal size and one smal- ler (Fig. 20). From this it will be seen that in a later stage of a karyokinesis i. c, in the anaphase and telophase the future cleavage plane is definitely fixed. 10 20 Fig. 15. Egg form which a portion is cut off at the anaphase. Fig. 16. The same divid- ing. Fig. 17. Egg from which a portion is cut off at the anaphase. Fig. IS. The same dividing. Fig. ig. Egg from which a portion is cut off at the beginning of the stcond cleavage. ( ) Fig. 20. The same at All the drawings Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nihon Do?butsu Gakkai; To?kyo? Do?butsu Gakkai. Tokyo : Societas
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