From the Proceedings of the American Convention of Abolition Societies may be obtained valuable information in the form of the reports as to slavery, the appeal of the anti-slavery groups to Congress, and their addresses to the citizens of the United States. There is unconsciously given in these documents most interesting facts as to what the Negro was doing and what was being done for him. The important documents falling within these three groups follow. * * * * * The Report of the Committee on the State of Slavery in the United States, being again considered, was amended and adopted as follows. _To the American Convention for the Abolition of Slavery, Ec._ The committee appointed (at the last session of the Convention) on the state of slavery in the United States, beg leave to report as follows: Your committee were rather at a loss to perceive the precise design of the Convention, in the appointment of a committee on the state of slavery in the United States. But have thought proper to review the subject; first with reference to its progress; secondly in reference to the situation or treatment of slaves; and thirdly in reference to the prospect of its diminution or final removal. First. In reference to the progress of slavery in the United States, your committee find that at the time of the first census under the Constitution in 1790, there were 694,280 slaves in the Union. These were with the exception of about 40,000, confined to a surface of about 212,000 square miles. In 1800, the number was 889,118 on a surface of 289,000 square miles or nearly so! In 1810, the number was increased to 1,191,364 and covered an extent of territory of about 431,000 square miles! At the time of the last census in 1820, the slaves in the United States and territories amounted to 1,538,178, and your committee have good reason to believe that the number at the present time or at the census of 1830, will be found to be about two millions, occupying a territory including Arkansas, of nearly 600,000 square miles!! Your committee have been surprised at the result of their own enquiries, for they had fondly hoped that the dreadful evil was if not diminishing, at least advancing with less rapidity. From various estimates, on which your committee place much reliance, they are confirmed in the opinion, that the increase (independent of clandestine importations) must amount at the present time to at least near 50,000 per annum. As this increase like that of population generally, is in its nature, a geometrical progression, it must continue to augment, as long as subsistence can be obtained. This view of the subject is truly alarming; but when we consider the extent of territory which is overspread by this foul blot on the map of our beloved country, the heart sickens at the prospect.