Letters and letter copy book belonging to the superintendents of the Trans-Allegheny Lunatic Asylum. The letters copied into the book were written by Dr. R. Hills, the superintendent of the asylum when it first opened to patients in 1864. These letters relate to the conditions of various patients in the asylum. There are also loose letters interleaved in the pages of the book written by or adressed to later superindents, including William A. Pratt and William Bland. These later letters mostly relate to purchases of food and other supplies for the hospital.