John G. Knauff was born in Germany. He was a physician and an apothecary, confining himself, however, more exclusively to the duties of the latter. I am informed that he was a man of sound education; but being retiring and unsocial in his habits, he made few friends. He was the first Treasurer of the Society. In 1807, he read before it a paper on the "Revulsive effects of blood-letting;" and in 1808, one on " The use of Hyosciamus Xiger." In 1809 he resigned his seat as member of the Society. His death occurred in 1810.