Among the numerous Authors of Observations in the Art of Physick, there are but few who have expressly written on the Treatment of those Distempers, most generally incident to an Army in the Field: The following Work, therefore, seems to have a fair Claim to be acceptable to the Publick, having been compiled during the Author’s Attendance on the _British_ Military Hospitals in _Germany_ in the late War; and in order to render it of still further Use, he has occasionally added, by Way of Note, the Practice of some of the most eminent Physicians in similar Diseases, as well as a few Histories of Cases which passed under his own Care at _St. George_’s Hospital, _London_. To avoid the Repetition of the Composition of particular Medicines, and the Interruption that would be given by their being inserted in the Body of the Work, a small Pharmacopœia is added, to which his Practice in the Army Hospitals was chiefly confined. In a commercial Country like our own, where Numbers of Hands are constantly wanted for the carrying on our Manufactories, we have a strong political Argument to add to that drawn from the Dictates of Humanity, why the Life of every individual should be most carefully attended to. The Preservation of the Lives of Soldiers is then with us a Matter of the highest Importance, in order to make as low as possible the Number of Recruits who must be perpetually drawn off for the Service of War. The Author has, therefore, in this Treatise, endeavoured to point out the Means most likely to keep Men healthy when employed in different Services; and also the Manner in which Military Hospitals ought to be fitted up, and conducted.--As he was never in any of the warm Climates, nor ever at Sea along with Troops aboard of Transports, whatever is mentioned relative to such Situations, is to be understood as taken from printed Accounts of these Subjects, or collected from the Conversation of physical Gentlemen, who were employed on such Services during the two last Wars. It is but Justice here to observe, that the Marquis of _Granby_, Commander in Chief of the _British_ Troops in _Germany_, as well as the Rest of the General Officers employed on the _German_ Service, always paid the greatest Attention to the Soldiers when sick in Hospitals; and were particularly ready in giving Orders for all such Things as were necessary or proper for them. JERMYN-STREET, April 15, 1764. CONTENTS. PAGE. Of the Malignant and Petechial Fever, 1 Of the Dysentery, 57 Of the Cholera Morbus, 97 Of the Inflammatory Fever, 104 Of the Angina, 109 Of the Pleurisy, 111