The surgeons assistant. : In which is plainly discovered the true origin of most diseases. Treating particularly of the plague, French pox, leprosie, &c. of the biting of mad dogs, and other venemous creatures. Also a compleat treatise of cancers and gangreens. With an enquiry whether they have any alliance with contagious diseases. Their most easie, and speedy method of cure. With diverse approved receipts. /