. A manual of zoology. iftern. qpro/t se^.nud Fig. 26.—Diagram illustrating the maturation and fertilisation of the ovum. A, formation of first polar globule; B, beginning of fertilisation, sperms approaching the micropyle or aperture in the enclosing membrane of the ovum through which the sperm enters; C, forma- tion of the male pronucleus; D, approximation of the male and female pronuclei; Et forma- tion of segmentation-nucleus; 9 cent, female centrosome; rf cent, male centrosome (the centrosomes are cell-structures not further referred to in this work); mem, egg-membrane; microp, micropyle;

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. A manual of zoology. iftern. qpro/t se^.nud Fig. 26.—Diagram illustrating the maturation and fertilisation of the ovum. A, formation of first polar globule; B, beginning of fertilisation, sperms approaching the micropyle or aperture in the enclosing membrane of the ovum through which the sperm enters; C, forma- tion of the male pronucleus; D, approximation of the male and female pronuclei; Et forma- tion of segmentation-nucleus; 9 cent, female centrosome; rf cent, male centrosome (the centrosomes are cell-structures not further referred to in this work); mem, egg-membrane; microp, micropyle; fiol, polar bodies; $ fron, female pronucleus; $ Pront male pronu- cleus; seg. ttucl, segmentation 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1900