The inefficacy of all mercurial preparations in the cure of venereal and scorbutic disorders, proved from reason and experience [electronic resource] : with a dissertation on Mr. de Velnos's vegetable syrup, which radically cures every species of the above disorders. And an accurate analysis o that medicine, Made by Order of the Marshal Duke of Biron, by Messrs. Rouelle, and La Cassaigme, Professors of Chymistry at Paris. To which are added, a refutation of Dr. Burrows's late scurrilous pamphlet. By Henry Saffory, Surgeon.