A treatise on the virtues and efficacy of a crust of bread, eat early in a morning fasting [electronic resource] : To which are added, some particular remarks concerning the great 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.