Drawing, vertebrae of the spines of birds by H [Henry] Earle Unpublished illustration showing five figures of spinal vertebrae, inscribed in pencil 'NB This drawing was cancelled, and another substituted for it! T.C.' [Taylor Combe]. The work is inscribed with publication and plate details. Signed 'Mr H. Earle 28 George St. Hanover Square [London]'. Royal Society stamp verso. Watermarked 'Slade'. The manuscript for this paper is wanting. Subject: Physiology Published in Philosophical Transactions as part of paper titled 'On the mechanism of the spine' by Henry Earle. Read to the Royal Society on 25 April 1822. [1822]