John SINCLAIR (1754–1835). Letter from the author, Westminster, July 27, 1806, addressed to “Dear Sir”; 1½ pages, in-8; in English. He sends him an article on athletic exercises and asks for his approval. It concerns a very interesting subject, not only from a military perspective but also from a medical one, since the same techniques that give strength to boxers and others trained in such exercises could, with proper organization and in moderation, be of benefit to the disabled: “It relates to a very interesting subject not only from a military but also from a medical point of view, for the same arts, by which strength is given to boxers and other persons trained in such exercises, may—with good management and in moderation—be of service to the disabled”…