"A Memoir on Hydraulics, printed in the Philosophical Transactions for 1808, was introductory to another in the same Collection for the following year, on the Functions of the Heart and Arteries. The connection between these subjects was considered by him... sufficiently close to give them both a professional character, and thus to exempt them from the restriction which he had imposed upon the class of publications which alone should be allowed to appear under his own name. ...Few persons can be found ...with a union of acquirements so remote from each other as to be able to prosecute an inquiry of this nature, or to judge of the correctness of the conclusions to which it leads; but as such it was exactly suited to Dr. Young, who delighted in questions so obscure and difficult, where his various knowledge and bold spirit of speculation had full room for their exercise."