Martin Heney, a celebrated Prussian chemist, professor of chemistry, member of the Academy of Sciences at Berlin, foreign associate of the Institute of France, and of several other academies and learned societies, was born at Berlin, on the 1st of December 1743. He had received from nature an observing, serious, reflecting mind, and a capacity of patient application which nothing could tire out or exhaust. After having terminated his classical studies, he applied himself wholly to that of mineralogy, for which he had a decided predilection; but he felt that he could not make rapid progress therein without calling in the aid of chemistry, wherefore he devoted himself to these two branches of physical science. The analysis of minerals appeared to him of extreme importance with re-