Caption:
Medecine / Anaesthesia. Ether mask after Gustave Juillard (1836 1911) (top right), 1890. Collection H. Stoeckel, Bonn. Narcosis mask after Friedrich v. Esmarch. (1823-1908) for chloroform anaesthesia. (bottom right), 1880. Collection H. Stoeckel, Bonn.