This want of success is not, we believe, inherent in the plan itself, but is the result of a want of proper management and supervision. We learn that the tenants often leave without paying rent, and that the building is more or less injured by their neglect. The class of tenants has undoubtedly been of a lower grade than that which has occupied the Boston houses, and the habits of the blacks are far inferior to those of the white American poor in personal neatness and care of their dwellings. But we have no doubt, that, in spite of these drawbacks, a good revenue might be derived from the rents paid by this class of tenants. The success of the Boston experiment is due in considerable part to the employment by the Association of a paid Superintendent, living with his family in one of the buildings, who has a general oversight of the houses, collects the rents, and determines the claims of occupants of the tenements. Such an officer is indispensable for the proper carrying on of any similar undertaking on so large a scale. We trust that no effort will be spared in New York to bring out more satisfactory results from this great establishment. Benevolence is one thing, and good investments another; but benevolence in this case does not do half its work, unless it can be proved to pay. It must be profitable, in order to be in the best sense a charity. The effect which the Boston houses have already had, in proving that homes for the poor can be built on the best plan for the health and comfort of their inmates and at the same time be good investments of property, is manifest in many private undertakings. Several large houses have already been built upon similar plans; old lodging-houses have been in several instances remodelled and otherwise improved; blocks of small dwellings for one or two families have been erected with every convenience for the class who can afford to pay from three to six dollars a week for their accommodations. The example set by the Association promises to be widely followed.