Discovery by Horace Wells of the applicability of nitrous oxyd gas, sulphuric ether and other vapors in surgical operations nearly two years before the patented discovery of Drs. Charles T. Jackson and W.T.G. Morton.

Licence: Public Domain Mark

Credit: Discovery by Horace Wells of the applicability of nitrous oxyd gas, sulphuric ether and other vapors in surgical operations nearly two years before the patented discovery of Drs. Charles T. Jackson and W.T.G. Morton. Source: Wellcome Collection.