Rev. THOMAS H. GALLAUDET, LL.D., well known as the pioneer of deaf-mute instruction in this country, died at Hartford, Conn., on the 10th of September, at the age of 64. Dr. G. first became interested in the cause to which his after life was devoted in 1807, having succeeded in conveying instruction to a deaf and dumb daughter of Dr. Cogswell in Hartford; and through the efforts of that gentleman he was commissioned to visit Europe for the purpose of qualifying himself to become a teacher of the Deaf and Dumb in this country. Seven gentlemen of Hartford subscribed a sufficient amount of funds to defray his expenses, and on the 25th of May, 1815, Mr. Gallaudet sailed for Europe. Meanwhile, the friends of the project employed the interval of time in procuring an act of incorporation from the Legislature of Connecticut, which was accomplished in May, 1816. In May, 1819, the name of "the American Asylum at Hartford for the Education and Instruction of the Deaf and Dumb," was bestowed by the Legislature on the first Institution for the deaf-mutes established in the United States. After spending several months in the assiduous prosecution of his studies, under the Abbé Sicard and others, Mr. Gallaudet returned to this country in August, 1816. He was accompanied by Mr. Laurent Clere, a deaf and dumb Professor in the Institution of Paris, and well-known in Europe as a most intelligent pupil of the Abbé. Mr. Clere is now living in a vigorous old age, and is still a teacher in the American Asylum at Hartford. The Asylum was opened on the 15th of April, 1817, and during the first week of its existence numbered seven pupils; it now averages 220 annually. Mr. Gallaudet became the Principal of the Institution at its commencement, and held the office until April, 1830, when he resigned, and has since officiated as Chaplain of the Retreat for the Insane at Hartford. His interest in the cause of deaf-mute education has always continued unabated, and his memory will be warmly cherished by that unfortunate class of our fellow beings as well as by a large circle of devoted friends.