Drawing, grey lamina of olivary body by J [Jacob Augustus] L [Lockhart] Clarke Plate 15, figure 25 showing convolutions of the grey lamina of the olivary body inside the medulla oblongata of a human. Inscribed with publication and plate details. Signed in ink bottom right, 'J. L. Clarke - June 1857'. The manuscript for this paper is wanting. Subject: Anatomy Published in Philosophical Transactions as part of paper titled 'Researches on the intimate structure of the brain, human and comparative.—First series. On the structure of the medulla oblongata' by Jacob Augustus Lockhart Clarke. Received and read by the Royal Society on 18 June 1857. June 1857