. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. 270 N. Fig. il. Egg cut vertically at the two-cell stage ( ) ; enucleated fragment on the left. Fig. 12. The same at 2 43 Fig. 13. Egg cut at the four-cell stage ( ) ; enucleat- ed fragment on the left. Fig. 14. The same drawn at (the egg proper) and at (enucleated fragment). All the drawing X igo. striction in the middle (Fig. 12). It, however, did not divide in two. Case F. An egg was cut at the four-cell stage by a vertical cut parallel to one of the two cleavage planes (Fig. 1
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. 270 N. Fig. il. Egg cut vertically at the two-cell stage ( ) ; enucleated fragment on the left. Fig. 12. The same at 2 43 Fig. 13. Egg cut at the four-cell stage ( ) ; enucleat- ed fragment on the left. Fig. 14. The same drawn at (the egg proper) and at (enucleated fragment). All the drawing X igo. striction in the middle (Fig. 12). It, however, did not divide in two. Case F. An egg was cut at the four-cell stage by a vertical cut parallel to one of the two cleavage planes (Fig. 13). The egg proper divided normally showing that the centrosomes had not been cut off by the operation. No asters appeared in the enucleated fragment. A deep constriction was found around the enucleated blastomere as in Fig. 12. It finally cut the fragment completely to four spheres, two large and two smaller (Fig. 14). From the above five cases it will be concluded that a mass of cytoplasm deprived of both the nucleus and aster shows various degrees of division activity which is usually indicated by a constriction but some- times is carried on to such a degree as the complete division eusues. 2. Fixity of the Cleavage Planes. It should here be noted, as will be described in full elsewhere, that when a portion of an egg is cut off at or prior to, the metaphase the result-. 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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Keywords: ., bookcentury1800, bookcollectionbiod, bookdecade1890, bookyear1897
