Plate, transverse sections of spinal column and cord of chick and cells from ganglia of chick and slug by J L [Jacob Augustus Lockhart] Clarke Figures 19-22 and 32-34 from plates XLVII and XLVIII showing transverse sections of the spinal column and cord of a chick, cells from the intervertebral ganglia of a chick, and cells from the suboesophageal ganglia of a slug. Subject: Physiology / Zoology Published in Philosophical Transactions as 'Researches on the development of the spinal cord in man, mammalia, and birds'. Received by the Royal Society on 20 May 1862. Read 19 June 1862. 20 May 1862