15. We have been thus particular in noticing this individual, because he was the first who gave public lectures on chemistry in Europe, and because he gave the first great impulse in favor of chemical medicines. He also carried his speculations concerning the philosopher's stone and the universal remedy, to the greatest height of absurdity; and, by exemplifying their inutility and fallacy in his own person, he contributed more than any one else to their disrepute, and subsequent banishment from the science.
16. Researches for the philosopher's stone, and the universal remedy, having been, at length, relinquished, the chemical facts which had been collected became, in the general estimation, a heap of rubbish of little value. At this time, there arose an individual thoroughly acquainted with these facts, and capable of perceiving the important purposes to which they might be applied.
17. The name of this individual was John Joachim Becher. He published a work in 1669, entitled "Physica Subterranica," by which he gave a new direction to chemistry, by applying it to analyzing and ascertaining the constituent parts of material bodies; and his system is the foundation of the science, as it now exists.
18. George Ernest Stahl, a medical professor in the University of Halle, adopted the theory of Becher, and, after his death, edited the work just mentioned; but he so simplified and improved it, that he made it entirely his own; and, accordingly, it has always been distinguished by the appellation of the Stahlian theory. The principal work of Stahl, on this subject, was published in 1729; and, since that time, chemistry has been cultivated with ardor in Germany, and in other countries in the north of Europe.
19. In France, chemistry became a fashionable study, about the middle of the eighteenth century. It had, however, been cultivated there by a few individuals, long before that period. Men of eminence now appeared in all parts of the kingdom, and discoveries in the science were made in rapid succession. Some attention was also paid to it in Italy and Spain.
20. In Great Britain, this subject attracted but little attention, except from a few individuals, until Dr. Cullen had become professor of the science, in the University of Edinburgh, in 1756. This accurate investigator of natural phenomena, succeeded in enkindling an enthusiasm for chemical investigations among the students; and the subsequent experiments of Dr. Black, Mr. Cavendish, Dr. Priestley, and Lavoisier, which resulted in the discovery of the constituent parts of air and water, diffused the same ardor through every part of the kingdom.
21. Lavoisier, the celebrated French chemist, having proved the Stahlian theory to be incorrect, founded another on the chemical affinities and combinations of oxygen with the various substances in nature. This system has been generally adopted; since it explains a great number of phenomena more satisfactorily than any other ever proposed. The great chemical agent, in the Stahlian system, was supposed to be an inflammable substance, which was denominated by the theorist phlogiston. To distinguish, therefore, the new theory from the one which it superseded, it was called the pneumatic, or anti-phlogistic system.
22. In 1787, a new technical nomenclature was devised, by the aid of which all the chemical facts are easily retained in the memory. Twelve or fifteen terms have been found sufficient for the foundation of a methodical language; and, by changing the terminations of these radicals, or by prefixing certain words or syllables, the changes that take place in bodies are clearly expressed. This valuable innovation originated with Lavoisier and three other French chemists.
23. In the present century, many important discoveries have been made in this science; and, among those who have been distinguished for their researches into its mysteries, Sir Humphrey Davy, of Great Britain, shines pre-eminent. In the United States, it has many able professors; among whom are Professors Hare and Mitchell, of Philadelphia, Torrey, Renwick, and Draper, of New-York, Henry, of Princeton, Beck, of Albany, Silliman, of New-Haven, and Johnson, of Middletown.
24. Chemistry is so extensive in its application, that we will not attempt to describe any of the operations of the laboratory. We, therefore, conclude this article by recommending this science to general attention; assuring the uninitiated, that it is beset with fewer difficulties than they are apt to suppose, and that every effort in the course will be attended with interesting facts and phenomena, which will abundantly reward the labor of investigation.