his professional traineeship with Dr Waterhouse, of Cambridge. His first subject was his cousin Sarah Guthrie, she had been vaccinated and to demonstrate the efficacy of the shot slept with the patients she volunteered to take care of as a nurse. During the winter of 1810-1811, he attended a course of medical lectures in New York and in January 1815 again at the University of Philadelphia, considered great advantages in his career. During this period he kept a diary for 31 days, 275 pages were written, some of them precisely illustrated. In them he noted and criticized his professor based on the content of his lecture. Guthrie, immediately after the degree, decided to join the U.S. Army and he distinguished himself by practicing the medical profession with honor and serving the local community. He worked as an army surgeon during the War of 1812, treating injured service members as American forces clashed with Great Britain over violations of maritime rights. After the war, in 1817, he moved to Sackets Harbor (then known as Sacket’s Harbor) with his family in 1817, practicing medicine while establishing himself as a manufacturer and inventor. During his life he cultivated also his passion for music, by learning and playing the violin. Achievements Discoveries Guthrie was most acceptably known as the inventor and manufacturer of an effective priming powder, called the "percussion pill" and the punch lock for it, which together replaced the flash-in-the-pan type of powder and made the old-fashioned flint-lock musket obsolete. As early as May, 1831, and probably earlier, his attention was turned to the "medicinal value of chloric ether," as set forth in Silliman's Chemistry. Percussion Pill In Sacket Harbor, he had also established a vinegar manufactory for supplying Madison Barracks, a military post established in 1812; here he also continued his experiments in the manufacture of powder. Guthrie's experiments with explosives, especially fulminating preparations, were, perhaps more extensive than those of any other man of his day, extending over a period of nearly forty years, during which time, he experienced many serious explosions; in one of these twenty-five pounds of half-dried powder burned with such energy as to lift the roof. In some of these explosions Guthrie sustained lasting and almost fatal injuries. Chloroform Guthrie's memoirs would be incomplete without a history of chloroform's discovery, a discovery that has immortalized the names of three men across the civilized world. The honor