Drawings, 'Pigeon' by [Martin Barry] Plate 5, figures 18-20 showing the formation of the ovum and the membrane of the ovisac of the pigeon [Columba livia]. Figures pasted onto backing sheet. Inscribed with figure details. Red ink inscriptions next to figures reading '42', '42 1/4', and '42 1/2' struck out in black ink. An ink inscription in top left corner reads '3' and there is an ink check mark next to each figure. Not signed. The manuscript for this paper is wanting. Subject: Biology / Zoology Published in Philosophical Transactions as part of paper titled 'Researches in embryology. First series' by Martin Barry Received by the Royal Society on 20 June 1838. Read 21 June 1838. [1838]