THOMAS EDDY, of New York, in a pamphlet on Prison Discipline, mentions a case, in which a number of desperate villains, in one room, within the walls of a Prison, were engaged in the business of counterfeit money, and were enabled to prosecute it by the connivance and assistance of a keeper. Even in the Prison at Auburn, which is in many respects so worthy of commendation, the Commissioners mention, in a late Report to the Legislature, that "one Terrence Heeney who was never fit for the trust of a guard, was three times appointed to that place, and three times removed for misconduct." They also say, that "several other cases have been proved of the appointment of incompetent or unfit men; but, in general, they were removed as soon as their unfitness became known." Mr. LYNDS, the superintendent of the Prison at Sing Sing, speaks of the character required in this situation as peculiar: viz. equanimity, quick discernment of character, impartiality, resolution, vigilance, promptitude, besides honesty and temperance, and, more than all, a habit of seeing much and saying little. He has not been without his difficulties in getting the right men. He mentions a case, in which an assistant keeper at Auburn was detected in employing convicts to steal for him. ROBERTS VAUX, of Philadelphia, in a pamphlet entitled 'Original and successive Efforts to improve the Condition of Prisons,' &c., mentions, that, in the Prison in Philadelphia, many years since, 'the keeper had been a long time connected with criminals, under circumstances which caused him to be suspected of a more intimate knowledge of the depredations committed in the city, than comported with that unblemished reputation which ought to belong to such an officer.' In the Baltimore Penitentiary, an officer was understood to say, that two assistant keepers had been discharged for circulating counterfeit money for convicts." There is another part of the discipline recommended by this Society, of which I cordially approve; it is that which relates to religious instruction. May God bless all their labours to give this part of their discipline a permanent residence in every prison on earth! I expect the time when prisons will be purified from sin--I expect a time when they will be no longer needed--and I expect this through the universal and perfect diffusion of the principles of the gospel. "When in the wisdom of God the world by wisdom knew not God, it pleased God, by the foolishness of preaching to save them that believe." The means of _grace_, then, are the only means of reformation. The means of _cruelty_ can effect no good in any heart. The gospel, _the gospel_; _this_ is the power of God unto salvation, and this alone can effect a salutary change in the soul.