A treatise on the virtues and efficacy of a crust of bread, [electronic resource] : eat early in a morning fasting: to which are added, some particular remarks concerning cures accomplished by the saliva, or fasting-spittle, as well when externally applied as when internally given, in the Scurvy, Gravel, Stone, Rheumatism, and divers other Diseases, arising from Obstructions. With some critical observations concerning the recrements of the blood; demonstrating, that, when regularly secreted, they both contribute to preserve the Life of Animals, and keep them in Health. By an eminent physician.