Newport, G. - On the impregnation of the ovum in the Amphibia. (Second series, revised.). And on the direct agency of the spermatozoon.

London, The Royal Society, 1853. 4to (28.0 x 21.9 cm). 58 pp. Disbound. Edges red. = Rare extract from the Philosophical Transactions, by George Newport, president of the Entomological Society of London. "Second series" implies that more has been published. Disbound, but with ample margins. A very good, clean copy.

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