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"Diagram illustrating the maturation and fertilization 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, formation of the male pronucleus; D, approximation of the male and female pronuclei; E, formation of segmentation-nucleus; female centrosome; male centrosome (the centrosomes are cell-structures not further referred to in this work); mem, egg-membrane; microp, micropyle; pol, polar bodies; female pronucleus; male pronucleus; seg. nucle, segmentation nucleus." -Parker, 1900

Ovum Fertilization

"Diagram illustrating the maturation and fertilization of the ovum. A, formation of first polar globule;…