From 1800 to 1810 the increase of the free colored population was 72 per cent., under the continued though somewhat slackened operation of the same cause. From 1810 to 1820 the increase had declined from 72 to 25 per cent.; for the very obvious reason that most of the Northern States had now no slaves to emancipate, while the Southern States were holding to the system of slavery with increased tenacity, and emancipation was becoming less frequent. From 1820 to 1830 the ratio of increase was again raised to 37 per cent. in ten years. By referring again to Table 71, it will be seen that in that decade, New York and New Jersey emancipated more than 15,000 slaves, adding them to the free colored population. From 1830 to 1840 the rate of increase declined to 21 per cent., and from 1840 to 1850 to only 12¼ per cent., and to 10 per cent. from 1850 to 1860.

These figures prove that from 1790 to 1840 the increase of the free colored population depended chiefly on the emancipation of slaves, and leave no reason to believe that its own natural increase ever exceeded 12¼ per cent. in ten years; while the average increase of the slave population is nearly 28 per cent. in ten years, and of the white population 34 per cent. in ten years. Thus, beyond controversy, the reproductive power of the colored population, always greatly inferior to that of the white population, is yet not half so great in freedom as in slavery. This difference is to be accounted for in great measure by the wicked and beastly stimulus applied to the increase of slaves, that the chattel market may be kept supplied.

There is no reason to suppose that the increase of the free colored population would be in a greater ratio if all were emancipated; but, as will appear from considerations yet to be presented, much for supposing that it would be in a much smaller ratio. How then would the case stand on that supposition? In 1860 there were about 27,000,000 of our white population, increasing at the rate of 34 per cent. in ten years; and less than 4,500,000 of colored population, increasing (on the supposition of universal freedom) in a ratio not exceeding 12¼ per cent. in ten years. Surely, that must be a very timid man who, in this relation of the parties, fears anything from the increase of free negroes. A war between these two races, so related to each other, is simply absurd, and the fear of it childish and cowardly. Slavery may multiply the colored population till its numbers shall become alarming; but if we will give freedom to the black man, we have nothing to fear from his increase.

But this certainly is not the full strength of the case. There is no good reason to believe that the natural increase of the free colored population is even 12¼ per cent. in ten years, but much for suspecting that even this apparent increase is the result of emancipation, either by the slave's own act, or by the consent of the master. If we take our departure from Chicago, make the tour of the lakes to the point where the boundary line of New York and Pennsylvania intersects the shore of Lake Erie, thence pass along the southern boundary of New York, till it intersects the Hudson river, thence along that river and the Atlantic coast to the southern boundary of Virginia, thence along the southern boundaries of Virginia and Kentucky to the Mississippi, thence along that river to the point where the northern boundary of Illinois intersects it, and thence along that boundary and the shore of Lake Michigan to the place of departure, we shall have embraced within the line described ten of the thirty-four States of the Union. By an examination of Table 42, already referred to, it will be seen that outside of those ten States the free colored population not only did not increase between 1840 and 1850, but actually diminished, and that all the increase of that decade was in those ten States.

Why then was there an increase in those ten States, while in the other twenty-four there was an actual decrease? I think this question can only be answered by ascribing that increase to emancipation. In Kentucky, Virginia, Maryland, and Delaware, slavery is unprofitable and declining, and acts of emancipation frequently occur. Pennsylvania and New Jersey, before the passage of the fugitive slave law of 1850, were favorite resorts of fugitives, perhaps partly on account of the known sympathies of the Quakers. Ohio, Indiana, and Illinois, were also resorted to by fugitives, both on account of their easy accessibility from adjacent Slave States, and their proximity to Canada, and also because such labor as a fugitive from slavery is best able to do, is there always in demand. These States have also received thousands of colored persons, brought to them by humane and conscientious masters, for the very purpose of emancipating them.

From 1850 to 1860 the facts are still more striking. The increase which occurred was not, as would have been true of a natural increase, scattered over our whole territory, and in some proportion to the colored population previously existing, but almost wholly, either where the unprofitableness and decline of slavery was leading to emancipation, or where from any cause the fugitive slave law of 1850 was not strictly enforced. Examples of the former are Maryland, Virginia, and Missouri, and of the latter are Ohio, Illinois, Michigan, Iowa, and even Massachusetts and Connecticut, in the latter of which it had been declining for twenty years previous.

With the facts before us, then, furnished by the United States Census, from 1790 to 1860, how is it possible to believe that the colored population of this country has ever increased at all, except hi slavery? How can we help seeing that it is slavery, and slavery alone, which has swelled their numbers from a little more than half a million, as it was in 1790, to near four and a half millions at the present time? Yet there are millions among us that turn pale at the thought of emancipation, lest thereby we should be overrun by the multiplication of the colored race! There are millions who would be thought intelligent men, who think they have propounded an unanswerable argument against emancipation When they have asked, 'What will you do with the negro?' We may well ask what shall we do with the negro, if we continue to multiply the race in slavery as beasts of burden and articles of merchandise. But on the supposition of freedom, the question has no significance. The men who are always scaring themselves and others by such fears are either very ignorant or very hypocritical.

But the case will be still stronger when we come to inquire, as we must before we close, into the causes of the facts which have just been presented. There is no reason to believe that the slower increase of the colored race is at all due to any original inferiority in the powers of reproduction, or that any such inferiority exists. Its causes are to be found wholly in the different circumstances, characters, and habits of the two peoples. The negro is, to a great extent, a barbarian in the midst of civilization. He is destitute of those comforts of life, that care, skill, and intelligent watchfulness, which are indispensable to success in rearing children in the midst of the dangers, exposures, and diseases of infancy. His dwelling does not afford the necessary protection from the cold and storms of winter, or from the heats of summer: it is ill warmed and ill ventilated; he has not an unfailing supply of food and clothing suited to the wants of that most frail and delicate of living creatures, a human infant. Hence a large portion of his children die in infancy.

On the last page of the Appendix to the volume already referred to, is a most instructive table, showing the truth of this operation. Thus in 1850 the white population of Alabama was 426,514; the colored population, slave and free, was 365,109. In that year the deaths of white children under five years of age were 1,650; of colored children, 2,463. That is, only two thirds as many white children died as colored; and yet the white population was greater almost in the ratio of 7 to 6. By running the eye down the table, it will be seen that similar facts exist in every State where there is a large colored population. These facts leave us in no doubt as to the reason why the increase of the colored population is always slower than that of the white population.

This occurs, as the table just referred to shows, under slavery, where the pecuniary interest of the master will secure his watchful coöperation with the parent to preserve the life of the infant. But in freedom the same causes act upon the colored race with vastly more destructive effect. The preservation of infant life and health is then left solely to the care, skill, and resources of the parent. The result is that decay of the colored race which we have seen indicated in the census. It is essential to our purpose that this point should be made quite plain.