The average number of white prisoners is eighty, not one-seventh of whom are females; and one hundred blacks, a third of these also being females. The prison discipline seems to be of a first rate order; and it is seldom necessary to punish for offences against the rules. Religious service is performed on Sundays, and a physician is in attendance every day. It is a singular fact, that only five persons have died there since it was opened, notwithstanding their former irregular habits. The prisoners are kept at constant labor; and their food, though not luxurious, is of a wholesome nature, which may, when their abstinence from intemperate habits is taken into consideration, account for the excellent state of their health. It would not be hazarding much to say that many here were never before accustomed to so many of the comforts of life--"in all, save these bonds;" for they lodge upon clean and comfortable bedding, surrounded by moscheto bars; and, once a week, at least, can enjoy the luxury of a bath. This is the receptacle of that class of society, both white and black, who are denominated vagrants. They embrace two sorts of individuals--those who have no visible means of obtaining a livelihood, and those who live by committing unlawful depredations upon others. Besides these, colored seamen, while in port, not being suffered by the laws to go at large, are accommodated, for the time being, with an apartment in the Work-house. Slaves are placed here by their masters, for punishment, for safe keeping, and for refusing to perform labor, as well as for the commission of crimes. These last are sent out in gangs, under keepers, to clean the streets, and to perform certain other menial services within the control of the municipal authorities. Nothing could render this establishment more complete, except a classification of its inmates; so that the hardened offenders should be prevented from drawing the young, the thoughtless, and the incipient transgressor, into the vortex of their own viciousness. To the philanthropist, this must be a consideration of the utmost importance. The saying, that "evil communications corrupt good manners," is illustrated even in this place--and here, many who seem upon the very verge of destruction, might be saved from ultimate and utter ruin, by the judicious care and protection of the humane and reflecting magistrate. THIRD MUNICIPALITY WORK-HOUSE This new establishment stands on Moreau street, running from Louisa to Piety streets, and taking within its limits the building formerly used as the Washington market, which has been altered to suit its present purpose. The buildings were prepared under the superintendence of Charles K. Wise, and are well arranged. The prisoners average about one hundred--thirty of whom are females. The regulations are excellent. THE COURT-HOUSE