By 1850, the buying States had another increase of 478,000 and the selling States 180,000. Total increase from 1840 to 1850, 658,000.[186] Deducting 50,000 illicitly imported,[187] we have 606,000 or about 24 per cent. total increase. Accordingly the selling States should have a natural increase of 326,000. Deducting the actual number we have left 146,000, which must have been transported. Deducting three-fifths on account of emigration, there would remain about 58,000 or nearly 6,000 per year for the domestic trade. Adding Texas to the buying States in 1850, they then have 1,663,000, and in 1860 2,296,000, or an increase of 633,000 during the decade. And the selling States 1,541,000 and 1,657,000 respectively, being an increase of 116,000. Total increase 749,000.[188] Deducting 70,000 which were brought in by illicit trade[189] we have a remainder of 679,000 or 21 per cent. natural increase. From natural increase selling States should have had 207,000 more than the actual. Deducting three-fifths on account of emigration leaves a little more than 8,000 per year sold South annually for these ten years. It is very probable that the emigration to the cotton States fell off during the fifties owing to the great prosperity in the border States, and it might be fair to reduce the number estimated to have been carried South by emigration to one-third or one-half, which would leave ten or twelve thousand per year for the domestic slave trade. We feel quite confident that this statistical review of the domestic slave trade, based as it is upon the Census Reports, gives a truer idea of the actual amount of the trade between the selling and the buying States than could be got from any other sources. FOOTNOTES: [Footnote 98: Acts Gen. Assembly of S.C. from Feb., 1791, to Dec., 1794, inclusive, Vol. I., 215.] [Footnote 99: Hurd: Law of Freedom and Bondage, Vol. II., p. 74-75.] [Footnote 100: Laws of the State of Delaware, 1793, p. 105.] [Footnote 101: Mr. Miner, of Pennsylvania, in a speech in Congress, January 6, 1829, read the following presentment made by the Grand Jury at Alexandria in 1802. "We the Grand Jury for the body of the County of Alexandria in the District of Columbia, present as a grievance the practice of persons coming from distant parts of the United States into this district for the purpose of purchasing slaves."--Gales and Seaton's Register of Debates in Congress, Vol. V., p. 177. At this time the foreign slave trade was prohibited by statutes in all the states.] [Footnote 102: Claibourne: Mississippi as a Province, Territory, and State, Vol. I., p. 144.] [Footnote 103: It is to be remembered that this was just before the opening of the foreign slave trade by South Carolina.] [Footnote 104: Monette: History of the Valley of the Mississippi, Vol. II., pp. 177-191, 269, 295, 547. Niles' Register, Sept. 13 and Oct. 18, 1817.] [Footnote 105: Census 1870. Population and Statistics, p. 4, 7 (recapitulation).]