. The cell in development and inheritance. Cells. 152 FERTILIZATION OF THE OVUM mined by at least two different factors, one of which is an attraction or other dynamical relation between the nuclei and the cytoplasm, the other an attraction between the nuclei. The former determines. Fig- 77- — Diagrams showing the paths of the germ-nuclei in four different eggs of the sea- urchin Toxopiu'iistes. From camera drawings of the transparent living eggs. In all the figures the original position of the egg-nucleus (reticulated) is shown at 9 ; the point at which the spermatozoon enters at E (entrance-
. The cell in development and inheritance. Cells. 152 FERTILIZATION OF THE OVUM mined by at least two different factors, one of which is an attraction or other dynamical relation between the nuclei and the cytoplasm, the other an attraction between the nuclei. The former determines. Fig- 77- — Diagrams showing the paths of the germ-nuclei in four different eggs of the sea- urchin Toxopiu'iistes. From camera drawings of the transparent living eggs. In all the figures the original position of the egg-nucleus (reticulated) is shown at 9 ; the point at which the spermatozoon enters at E (entrance-cone). Arrows indicate the paths traversed by the nuclei. At the meeting-point {M) the egg-nucleus is dotted. The cleavage-nucleus in its final position is ruled in parallel lines, and through it is drawn the axis of the resulting cleavage- figure. The axis of the egg is indicated by an arrow, the point of which is turned away from the micromere-pole. Plane of first cleavage, passing near the entrance-point, shown by the curved dotted line. the entrance-path of the sperm-nucleus, while both factors probably operate in the determination of the copulation-path along which it travels to meet the egg-nucleus. The real nature of neither factor is 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 Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York : The Macmillan company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcells, bookyear1896
