Paper, 'On the impregnation of the ovum in the amphibia (second series, revised) and on the direct agency of the spermatozoon' by George Newport Subject: Zoology / Physiology Published in Philosophical Transactions as 'On the impregnation of the ovum in the amphibia. (Second series, revised.) And on the direct agency of the spermatozoon'. Received by the Royal Society on 10 May 1852. Read 17 June 1852. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 6, 1854. [1852]