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Referring to his account of the process of fecundation of the mammalian ovum and the immediately succeeding phenomena, published in various papers in the Philosophical Transactions, the author calls attention to the confirmation which his views have received from corresponding observations made by subsequent inquirers on the ova of other animals. He more particularly adverts to a recently published memoir by Dr. Keber, in which that physiologist describes the penetration of the spermatozoa into the interior of the ovum, inUnio andAnodonta , through an aperture formed by dehiscence of its coats, analogous to the micropyle in plants.

abstracts of the papers communicated to the royal society of london

Researches in embryology; a note supplementary to papers published in the philosophical transactions for 1838, 1839 and 1840, showing the confirmation of the principal facts there recorded, and pointing out a correspondence between certain structures connected with the mammiferous ovum and other ova