Researches, Chemical and Philosophical; Chiefly Concerning Nitrous Oxide
Humphry Davy's account of breathing nitrous oxide at Thomas Beddoes's Pneumatic Institution in Bristol in 1799, from the fourth part of his Researches. The excerpt gives Davy's own experiments, including the session that ended with "Nothing exists but thoughts!", and the reports he collected from Robert Southey, Peter Roget, Samuel Taylor Coleridge, and Thomas Wedgwood.
1800
Source
Nitrous OxideSelf-ExperimentAnesthesia
Humphry Davy