. The cell; outlines of general anatomy and physiology. Fig. 120.—Surface view of the first cleavage stage of a Hens egg (after Coste): a edgeof germinal disc ; b vertical furrow ; c small central portion ; d large peripheral portion. age occurs (Fig. 92). Whilst, however, it gradually deepens andsinks in until it has cut its way through to the vegetative pole, thegerminal disc is divided into two equal segments, which rest liketwo buds, with their broad bases upon the undivided yolk-mass, THE VITAL PHENOMENA OF THE CELE 231 and are thus connected with one another. Soon afterwards asecond vert
. The cell; outlines of general anatomy and physiology. Fig. 120.—Surface view of the first cleavage stage of a Hens egg (after Coste): a edgeof germinal disc ; b vertical furrow ; c small central portion ; d large peripheral portion. age occurs (Fig. 92). Whilst, however, it gradually deepens andsinks in until it has cut its way through to the vegetative pole, thegerminal disc is divided into two equal segments, which rest liketwo buds, with their broad bases upon the undivided yolk-mass, THE VITAL PHENOMENA OF THE CELE 231 and are thus connected with one another. Soon afterwards asecond vertical furrow makes its appearance, crossing the first atright angles, and terminating in a similar manner at the germinaldisc, which is now split up into four segments (Figs. 120 B, 121 B).In this case also a cleavage line is formed. B G
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Keywords: ., bookcentury1800, bookdecade1890, bookidcelloutlines, bookyear1895
