. Cytology, with special reference to the metazoan nucleus. Cells. Fig. 34. Syngamy in various animals. A, Physa fontanalis (after Kostanecki and Wierzejski, , 1896) just after entry of spermatozoon ; B, the mouse (after Lams and Doorme, , 1908) spermatozoon in the act. of entering the egg ; C, D, successive stages in the fusion' of the gamete nuclei in Ophryotrocha puerilis (after Korschelt, , 1895) ; E, F, the penetration of the amoeboid spermatozoon in Ascaris canis (after Walton, , 1918). c, centrosome in middle piece ; h, head ; t, tail of spermatozoon. formed under th
. Cytology, with special reference to the metazoan nucleus. Cells. Fig. 34. Syngamy in various animals. A, Physa fontanalis (after Kostanecki and Wierzejski, , 1896) just after entry of spermatozoon ; B, the mouse (after Lams and Doorme, , 1908) spermatozoon in the act. of entering the egg ; C, D, successive stages in the fusion' of the gamete nuclei in Ophryotrocha puerilis (after Korschelt, , 1895) ; E, F, the penetration of the amoeboid spermatozoon in Ascaris canis (after Walton, , 1918). c, centrosome in middle piece ; h, head ; t, tail of spermatozoon. formed under the influence of the sperm centrosome. This is the achromatic figure of the zygote nucleus, for after the formation of the second polar body the entire achromatic figure of the egg, including the centrosomes, disappears. Thus the centrosome, and hence the whole achromatic figure of the zygote, is entirely derived from the spermatozoon. This conclusion is based on numerous observations, and also is well. 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 Agar, W. E. (Wilfred Eade), 1882-1951. London, Macmillan and Co. , limited
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcells, bookyear1920
