Larrey, in his military campaigns, noticed the effect of cold in diminishing sensitiveness, and suggested that cold might be made a useful local anæsthetic. Many surgeons used to operate upon patients under the influence of alcoholic narcotization. It was in 1776 that Mesmer arrived in Paris and became the exponent of so-called "animal magnetism,"--later termed "mesmerism," now known as hypnotism,--under the influence of which he reduced to the state of unconsciousness of pain (i.e., analgesia, as well as the more complete condition, anæsthesia) a number of patients, who were operated upon without feeling the slightest suffering. But, in spite of the earnest attempts of humane surgeons in various parts of the world, no agent had been discovered which was proven safe and generally effectual, up to the time, for instance, of Velpeau, who in 1839 wrote: "To escape pain in surgical operations is a chimera which we are not permitted to look for in our time." The substance known as sulphuric ether has been known{303} since the thirteenth century, when, as it appears, Raymond Lulli made certain--perhaps ambiguous--references to it. In 1540 it was known as the sweet oil of vitriol. It was not called an ether until 1730, when Godfrey spoke of it as such. It was frequently referred to during the last century by various writers, and the first reference to its inhalation seems to have been published in 1795 by Pearson. In a work by Beddoes, on Factitious Airs, published at Bristol, in 1796, is a statement that "Ether in pectoral catarrh gives almost immediate relief, both to the oppression and pain in the chest." Beddoes also states that after inhaling two spoonfuls he soon fell asleep. Later it was in somewhat general use internally for mitigating the pains of colic. By 1812 it was often inhaled for experiment or diversion, its peculiar exhilarating effects being generally known. So it is, perhaps, not strange that so soon as it was definitely recommended for purposes of surgical anæsthesia, a number of claimants for the honor of its discovery should quickly arise. It was the same with nitrous-oxide gas, which had been knowrn for a number of years, and which was repeatedly used for the purpose of anæsthesia before the introduction of ether for the same purpose. Chloroform was discovered in the year 1831 by Guthrie, of Sackett's Harbor, New York, and about the same time by Soubeiran, in France, and Liebig, in Germany. But, although before the profession for sixteen years, it was not recommended for the same purpose as sulphuric ether until 1847, and then by Doctor--later, Sir--James Simpson.