A letter from an apothecary in London, [electronic resource] : to his friend in the country; concerning the present practice of physick, in regard to empiricks, empirical methods of cure, and nostrums. With remarks on Dr. Meads, Mr. Freke's, and Mr. Cheselden's method of cure for the itch, by externals only; setting forth the Dangerous Consequences of such a Method, if adhered to indiscriminately. Also some observations upon manna, shewing it to be a Composition though commonly supposed a Natural Production; with remarks on Dr. Mead's certain cure for the bite of a mad dog.