Paper, 'Observations on the Hirudo vulgaris' by James Rawlins Johnson 12 manuscript pages and one plate showing various parts of the anatomy of the Hirudo vulgaris [leech]. Subject: Zoology Published in Philosophical Transactions as 'Observations on the Hirudo vulgaris'. Written by Johnson in Bristol. Read 14 November 1816. 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 2, 1833. 30 October 1816