Drawing, grey substance from dorsal region of calf spinal chord by J [Jacob Augustus] L [Lockhart] Clarke Plate 22, figure 9 showing an outline of a section of the grey substance through the lower part of the dorsal region of the spinal chord of a calf. Inscribed with publication and plate details. 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]