"AUCTION SALE.--The undersigned will offer for sale, through the ministry of a public auctioneer, on her plantation, near Carancro, in the parish of St. Landry, on Monday the 5th day of February next, and the following days, one hundred choice slaves, of both sexes and different ages, among which is a good blacksmith and several other mechanics. These slaves will be sold separately, and under full and satisfactory guarantee of titles.--8 ox-carts, 69 work-oxen, 20 mules, 20 work-horses, 1,500 barrels of corn, 12,500 cypress pickets. Conditions of Sale.--The slaves will be sold on a credit of one and two years from the day of sale; purchasers giving sufficient security to the satisfaction of the vendor, and the slaves remaining specially mortgaged until final payment of principal and the interest which may accrue thereon, at the rate of eight per cent per annum from time due until final payment. The conditions of the sale of the movable property will be made known on the day of sale. WIDOW HYPOLITE CRETIEN. "Opelousas, January 3d, 1849." Literally speaking, tens of thousands of such advertisements as these might be adduced. You can hardly open a Southern paper without finding several. Part of the trade is carried on by water. This part of the trade is regulated by Act of Congress (Act March 2, 1807, sect. 8-10), and slavers sail apparently with commendable regularity. The following notice is taken from the "National Intelligencer" a few years since:-- "ALEXANDRIA AND NEW ORLEANS PACKETS.--Brig Tribune, Samuel C. Bush, master, will sail as above on the 1st January; brig Isaac Franklin, William Smith, master, on the 15th January; brig Uncas, Nathaniel Boush, master, on the 1st February. They will continue to leave this port on the 1st and 15th of each month, throughout the shipping season. _Servants that are intended to be shipped will at any time be received for safe keeping at twenty-five cents a day._ JOHN AMFIELD, Alexandria." The two following advertisements are taken from the "American Beacon" of January 24, 1848, published at Norfolk, Virginia. They are advertisements of the same person, who, as we have just seen, offers to "attend to shipping of negroes to any of the Southern ports:"-- "FOR NEW ORLEANS.--Virginia and Louisiana Line Packets. The fast-sailing packet barque Bachelor, Page, master, will sail for the above port from the 20th to the 27th inst. For freight, cabin or steerage passage, for which she has good accommodations, apply to G. W. APPERSON."