Letter, 'On a canal in the medulla spinalis of some quadrupeds' from Mr Wm [William] Sewell to Everard Home Subject: Zoology Published in Philosophical Transactions as 'A letter on a canal in the medulla spinalis of some quadrupeds'. Written by Sewell at [London] Veterinary College to Home at Sackville Street, London. Read 8 December 1808. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 1, 1832. 26 November 1808