was made in Vincennes, before Napoleon III and many of his generals. This system was adopted by the French government, and a large portion of the Mont Cenis Tunnel was blasted with "la poudre comprimée." While in Paris, he was invited to fill the chair of chemistry and physics in the College of the City of New York. His lectures on toxicology at Bellevue Hospital Medical College resulted in his being called upon by coroners and district attorneys to examine poison cases, and he introduced radical changes in the system of medical jurisprudence. He established a special toxicological laboratory, with a dissecting room attached, kept under lock and key, using only reagents of known purity, and purchasing new glass and porcelain vessels for each case. Doremus further insisted that the expert should have ample time for his researches, and that he should be properly remunerated for his services. His course led to more thorough scientific investigation than was formerly common in poison examinations. In the case of James Stephens, convicted of poisoning his wife, Doremus analyzed not only the entire body of Mrs. Stephens, but another human body, to test the question of "normal arsenic." He was the expert in the celebrated Burdell murder case (1857), and examined the blood-stains found in Dr. Burdell's room. In another case he proved the presence of strychnine in a body that had been buried for four months. In 1865 the "Atlanta" arrived at quarantine, and during her voyage from Liverpool sixty of her passengers had died from cholera. A quick method of disinfection was necessary, and Doremus recommended that chlorine in enormous quantities be used. Under his direction, specially prepared vessels for the generation of this powerful gas were introduced between decks, the hatches battened down, and the vapor allowed to accomplish its work of destroying germs. This treatment proved thoroughly successful, and in 1875 the process was again used, with equal success, in the disinfection of hospital wards. In 1871 he was appointed president of a Board for examining the druggists and their clerks in New York city, which in six months examined over 900 persons. He obtained aid from the Board of Health in suppressing the gases emanating from the gas houses, and opposed its action in adopting the "lactometer with the senses" as the sole means of testing the purity of milk. Doremus was known as a brilliant lecturer on