Drawing, caudate vesicles by J [Jacob Augustus] L [Lockhart] Clarke Plate 25, figure 15 showing caudate vesicles with fibrils of anterior roots of nerves, from the lumbar enlargement of the spinal chord of a calf. Inscribed with publication and plate details (although erroneously labelled as '1824'). An outline of another figure is visible verso in ink. Signed in ink bottom left 'J. L. Clarke ad nat delt.' Subject: Anatomy Published in Philosophical Transactions as part of paper titled 'Researches into the structure of the spinal chord' by Jacob Augustus Lockhart Clarke. Received by the Royal Society on 15 October 1850. Read 5 December 1850. [1850]