Illinois, by her constitution of 1818, continued slavery in the State, but declared that 'children hereafter born shall be free.' An effort was made in Congress to defeat the admission of Illinois, on the ground that its constitution 'did not conform to the ordinance of 1787.' But it was then decided by the House of Representatives (117 to 54) that 'the ordinance did not extend to States.' In the Senate the vote was unanimous. (See Niles's Register, vol. xix. p. 30.) Rhode Island adopted the Pennsylvania system. Connecticut declared free, at the age of 26, all born after the 1st March, 1784. Indiana pursued in its results the course of Illinois. By the census, Illinois had 917 slaves in 1820, 747 in 1830, 331 in 1840; and Indiana had 190 slaves in 1820, 3 in 1830, and 3 in 1840. New York in 1799 continued in bondage the slaves then living, but those born after the date of the law were emancipated at the age of 28; and in New Jersey, the males at 25 and the females at 21. This slow and gradual process in States having so few slaves, should inculcate kinder and more indulgent feelings as to those loyal communities where the slaves are so much more numerous, and the time and mode of action so vital.

The great model act of gradual emancipation, drawn by Benjamin Franklin, the great leader on this question, approved by the Quakers, and adopted by Pennsylvania in 1780, liberated all the descendants of slaves born after that date within the limits of the State. To avoid circumlocution, I shall call those born before the date of emancipating laws the ante nati, and those born after the date of such laws, post nati.

I shall consider first the question of gradual emancipation and colonization in connection with Maryland, and afterward apply the same principles to other States.

If the Pennsylvania system of liberating immediately only the post nati, so much more liberal than that of most of the free States, were adopted by Maryland, the cost of manumission there would be very small. In the execution of the emancipation act of Congress in this District, infant slaves were valued officially this year by sworn experts at $50 each. Now by the census of 1860, the infant slaves of Maryland, under one year old, surviving on the 1st June, 1860, numbered 2,391, which, at $50 each, would cost $119,550. This would be the actual expense for the first year in Maryland, but decreasing every year, and ceasing altogether in little more than a generation. Now the total number of slaves under one year of age, born in all the slave States, and surviving on the 1st June, 1860, was, by the census, 113,581, which, at $50 each, would cost $5,679,050, for the first year, and decreasing annually as above stated. The post nati numbered in Delaware 40, in Kentucky 7,281, in Missouri 3,377, and in Virginia 13,850, making the first year's cost as follows:

Maryland$119,550
Delaware2,000
Kentucky364,050
Missouri168,850
————
654,450
Virginia692,500
————
Total,$1,346,950

Now then, applying this principle to Maryland, Delaware, Kentucky, and Missouri, the cost, the first year, would be $654,450, and, if we included Virginia, $1,346,950. This sum, we have seen, would decrease every year. According then to the annual tables, and those of expectancies of life (as calculated for me), the sum of fifteen millions of dollars of United States stock, issued now, and bearing interest at the rate of six per cent, per annum, would make all the border States free States, in the same sense in which Pennsylvania and other Northern free States became so; and less than half this sum, if Virginia should not adopt the measure. The case, then, as regards the border States, presents no financial difficulty whatever. If this plan were adopted, the same just and humane course would doubtless be pursued as in the North, by which the emancipated post nati would remain apprentices until they reached twenty-one years of age, under the same regulations, mainly, as were applicable to white children, bound out by the overseers of the poor. Should the border States consent to proceed more rapidly, I have no doubt the Government would cheerfully pay to loyal masters such additional sum as would give freedom to every slave in all the border States, on the 4th of July, 1876, our first centennial anniversary of the Declaration of American Independence. That day, then, already so distinguished in the annals of humanity, would become the great epoch in the history of our race.

And now let us examine the cost of all these measures. If the seceded States, including Virginia, should persist in the rebellion until after the close of this year, the sum to be paid the loyal owners of slaves manumitted under the President's war proclamation would probably reach $100,000,000. The emancipation of the post nati, in the four remaining border States, would cost §7,288,132. The manumission in those States, of all the surviving slaves, on the 4th July, 1876, according to the same tables and estimates, would cost a sum equal to $65,000,000, issued now as United States six per cent. stock, making a total for complete emancipation in all the slave States of $172,288,132. This is a smaller sum than four months' cost of the war, whilst wholly and forever removing the discordant element which produced the rebellion, commencing a new and glorious career of material, moral, and intellectual progress, greatly exalting the character of the nation, invoking the blessing of God, securing the future harmony and perpetuity of the Union, and the ultimate fraternity of man. Never, before, would any nation have made so grand an investment in the gratitude of emancipated millions, the thanks of a world redeemed from bondage, the applause of the present age and of posterity—the exchequer of time and eternity. It would live forever in history, and the recording angel would inscribe it in God's eternal archives. Statesmen, scholars, savans, philosophers, poets, patriots, orators, and divines would proclaim its glory. The new drama of man's political redemption would be witnessed by the audience of the world. Music would chant its praise in every clime, and all peoples would swell the chorus. The painter would give it immortality, and the sculptor monuments more enduring than the pyramids, statues more godlike and sublime than ever crowned Grecian Parthenon, or adorned with Parian marble the temples of Augustan Rome. The press would glow with enthusiasm, and the procession of nations march in the grand ovation, not to national airs, or under national banners, but under the world's new flag, and to the music of the world's new anthem of universal freedom and regenerated man.

The census proves that our progress as a nation has been greatly retarded by slavery. If the North had retained, and the South had abolished slavery, their relative positions would have been reversed. Virginia would have taken the place of New York, Maryland of Massachusetts, Delaware of Rhode Island, Kentucky of Ohio, Missouri of Illinois, and Tennessee of Indiana.

I begin with Maryland, because, in proportion to her area, she has greater natural advantages than any one of the thirty-four States, and, if the comparison with the free States is most unfavorable to her, it will be more so as to any other Southern State, as the census shows that, from 1790 to 1860, and from 1850 to 1860, Maryland increased in population per square mile more rapidly than any other slaveholding State.

Maryland borders for two hundred miles the great free State of Pennsylvania, and Delaware one hundred and thirty miles, whose slaves have decreased from 8,887 in 1790, to 1,798 in 1860, and where slavery now exists in name only. Delaware, like Maryland, is also a loyal State, and would be the last to leave the Union, which it was her glory first to enter under the Constitution of 1787. On the west, Maryland is bounded by Preston county, Virginia, containing in 1860 a free population of 13,312, and 67 slaves only. Western Virginia, bordering Maryland on the south, has voted with great unanimity to become a free State, and all appearances indicate that slavery will disappear from Virginia with the close of this year. Maryland then would be surrounded entirely by non-slaveholding States.