The copy of a letter written by E.D. Doctour of Physicke to a gentleman, by whom it was published : The former part conteineth rules for the preseruation of health, and preuenting of all diseases vntill extreme olde age. Herein is inserted the authours opinion of tabacco. The latter is a discourse of emperiks or vnlearned physitians, wherein is plainly prooued that the practise of all those which haue not beene brought vp in the grammar and vniuersity, is alwayes confused, commonly dangerous, and often deadly.