Unpublished paper, 'On motion in the lumbar division of the spine of birds' by George Oakley Fleming Fleming quotes from the works of Cuvier, Blumenback, Tiedemann, Macartney, Vicq d'Azyr, Carus, Earle, and Roget, suggesting that the prevalent opinion among comparative physiologists is that the dorsal and lumbar portions of the spine form altogether a rigid structure, not admitting of the lease perceptible flexion. Followed by three plates of figures of bird bones by H L Steiner. Subject: Zoology / Ornithology Received 18 December 1845. Read 26 November 1845. Communicated by Thomas Bell. An abstract of the paper was published in volume 5 of Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society] as 'On motion in the lumbar division of the spine in birds'. 1845