1. A Milestone in Anæsthesia?
2. RICHARD. HAKLUYT, The Principal Navigations, Voyages, Traffiques and Discoveries of the English Nation (1907);
3. Everyman Edition . J. M. Dent, Vol. 7, p. 272 et seq.
4. 4SIR WALTER RALEIGH (1596 ). The Discoveries of the Rich and Beautiful Empyre of Guyana....