Unpublished letter, 'Facts and observations relative to the connections and continuity between vascular and extra-vascular substances in the structure of living organic bodies' from Anthony Carlisle to Sir Joseph Banks Carlisle discusses connections between different species with respect to vascular and extravascular parts of the body, discussing humans, cattle, snails, birds, and univalves. Subject: Comparative Anatomy Written by Carlisle in Soho Square [London]. Read to the Royal Society on 15 June 1815. 30 May 1815