Paper, 'On the impregnation of the ovum in the stickleback [family Gasterosteidae]' by W H [William Henry] Ransom Ransom shares the principal results of experiments made during June and July 1853 regarding the impregnation of the ovum in Gasterosteus leiurus and G. pungitius. Annotations in pencil and ink throughout. Subject: Zoology / Ichthyology / Reproduction Received 20 October 1854. Communicated by Dr [William] Sharpey. This paper was published in full in volume 7 of the Proceedings of the Royal Society as 'On the impregnation of the ovum in the stickleback'. 15 October 1854