The last production of Dr. Cheyne was his “_Natural Method of Curing the Diseases of the Body, and the Disorders of the Mind Depending on the Body_. In three parts. Part I.--General Reflections on the Economy of Nature in Animal Life. Part II.--The Means and Methods for Preserving Life and Faculties; and also Concerning the Nature and Cure of Acute, Contagious, and Cephalic Disorders. Part III.--Reflections on the Nature and Cure of Particular Chronic Distempers. 8vo. Strahan, London, 1742.” It is dedicated to the celebrated Lord Chesterfield, who records his grateful recognition of the benefits he had experienced from his methods. He writes: “I read with great pleasure your book, which your bookseller sent me according to your direction. The physical part is extremely good, and the metaphysical part _may be_ so too, for what I know, and I believe it is, for as I look upon all metaphysics to be guess work of imagination, I know no imagination likelier to hit upon the right than yours, and I will take your guess against any other metaphysician’s whatsoever. That part which is founded upon knowledge and experience I look upon as a work of public utility, and for which the present age and their posterity may be obliged to you, if they will be pleased to follow it.” Lord Chesterfield, it will be seen below, was one of those more refined minds whose better conscience revolted from, even if they had not the courage or self-control to renounce, the Slaughter House. The _Natural Method_ its author considers as a kind of supplement to his last book, containing “the practical inferences, and the conclusions drawn from [its principles], in particular cases and diseases, confirmed by forty years’ experience and observation.” It is the most practical of all his works, and is full of valuable observations. Very just and useful is his rebuke of that sort of John-Bullism which affects to hold “good living” not only as harmless but even as a sort of merit--