If that institution is to serve the double purpose of a penitentiary for convicts, and a house of detention or hospital for lunatics of dangerous or criminal tendencies, let the departments be kept distinct, and each be furnished with such attendance, supervision, &c., as their circumstances require. This arrangement would very nearly resemble that at the Blockley Almshouse, under which the two thousand paupers are received and provided for in the appropriate wards of the house, while the two or three hundred lunatics of various classes have a distinct department, though all are under the same general superintendence. So in the reports, the same distinction would be made between the convicts proper, who are undergoing the process of punishment, and those who from alienation of mind, antecedent or subsequent to their reception as prisoners, are not proper subjects of penal suffering, though they are proper subjects of personal restraint, and, as such, have a lodging within the prison walls. In a word, if our penitentiary must be used for the detention or custody of lunatics whatever their character or grade, let it have due credit as a hospital, and not suffer undeserved reproach as a penitentiary. ART. V.--FINAL REPORT OF THE COMMITTEE ON THE ERECTION OF THE NEW GAOL FOR SUFFOLK COUNTY (MASS.), pp. 44. This document was presented, not long since, to the authorities of the City of Boston; and, as it gives us the history of a prison structure quite unique, in some respects, we think our readers will be interested in a brief notice of it. The County of Suffolk is made up of the City of Boston, with a population of 140,000, and the town of Chelsea, with a population of 7,000. The County Gaol, situated in Leverett street, in the heart of the city, was, for almost twenty years, the subject of complaint. It was irremediably defective in construction, and incapable of being warmed or ventilated, and afforded no means of classification. The site of it was ill adapted to the purpose. It embraced 4800 square feet of land, valued at $1.50 or $2.00 a foot.