The Rev. Cortlandt Van Renselear, formerly of Albany, but who has lately resided in Virginia, addressed the meeting, and after alluding to the difference of opinion which prevailed among the friends of Colonization, touching the present condition and treatment of the colored population in this country, proceeded to offer reasons why the people of the North should approach their brethren in the South, who held the control of the colored population, with defference, and in a spirit of kindness and conciliation.

These reasons were briefly as follows: 1. Because the people of the South had not consented to the original introduction of slaves into the country, but had solemnly, earnestly, and repeatedly remonstrated against it. 2. Because having been born in the presence of slavery, and accustomed to it from their infancy, they could not be expected to view it in the same light as we view it at the North. 3. Slavery being there established by law, it was not in the power of individuals to act in regard to it as their personal feelings might dictate. The evil had not been eradicated from the state of New York all at once: It had been a gradual process, commencing with the law 1799 and not consumated until 1827. Ought we to denounce our Southern neighbors if they refuse to do the work at a blow? 4. The constitution of the United States tolerated slavery, in its articles apportioning representation with reference to the slave population, and requiring the surrender of runaway slaves. 5. Slavery had been much mitigated of late years, and the condition of the slave population much ameliorated. Its former rigor was almost unknown, at least in Virginia, and it was lessening continually. It was not consistent with truth to represent the slaves as groaning day and night under the lash of tyranical task-masters. And as to being kept in perfect ignorance, Mr. V. had seldom seen a plantation where some of the slaves could not read, and where they were not encouraged to learn. In South Carolina, where it was said the gospel was systematically denied to the slaves, there were twenty thousand of them church members in the Methodist denomination alone. He knew a small church where out of 70 communicants, 50 were in slavery. 6. There were very great difficulties connected with the work of Abolition. The relations of slavery had ramified themselves through all the relations of society. The slaves were comparatively very ignorant; their character degraded; and they were unqualified for immediate freedom. A blunder in such a concern as universal abolition, would be no light matter. Mr. V. here referred to the result of experience and personal observation on the mind of the well-known Mr. Parker, late a minister of this city, but now of New-Orleans. He had left this city for the South with the feeling of an immediate abolitionist; but he had returned with his views wholly changed. After seeing slavery and slave-holders, and that at the far South, he now declared the idea of immediate and universal abolition to be a gross absurdity. To liberate the two and a half millions of slaves in the midst of us, would be just as wise and as humane, as it would be for the father of a numerous family of young children to take them to the front door, and there bidding them good bye, tell them they were free, and send them out into the world to provide for and govern themselves. 7. Foreign interference was, of necessity, a delicate thing, and ought ever to be attempted with the utmost caution. 8. There was a large amount of unfeigned Christian anxiety at the South to obey God and do good to man. There were many tears and prayers continually poured out over the condition of their colored people, and the most earnest desire to mitigate their sorrows. Were such persons to be approached with vituperation and anathemas? 9. There was no reason why all our sympathies should be confined to the colored race and utterly withheld from our white southern brethren. The apostle Paul exhibited no such spirit. 10. A regard to the interest of the slaves themselves dictated a cautious and prudent and forbearing course. It called for conciliation: for the fate of the slaves depended on the will of their masters, nor could the north prevent it. The late laws against teaching the slaves to read had not been passed until the Southern people found inflamatory publications circulating among the colored people. 11. The spirit of the gospel forbade all violence, abuse and threatening. The apostles had wished to call fire from heaven on those they considered as Christ's enemies; but the Saviour, instead of approving this fiery zeal, had rebuked it. 12. These Southern people, who were represented as so grossly violating all Christian duty, had been the subjects of gracious blessings from God in the outpourings of his Spirit. 13. When God convinced men of error, he did it in the spirit of mercy; we ought to endeavor to do the same thing in the same spirit.

The only remaining testimony relates to the states of Louisiana and Mississippi, in the south west. The letter from which it is taken is written by a son of that Mr. Finley, who perhaps more than any one else, set on foot the original scheme of African colonization; and whose name, as a man of pure and enlarged benevolence and wisdom, the enemies of his plans quote with respect. The son well deserves to have had such a father.

New-Orleans, March 12, 1835.

In my former letter I gave you some account of the leading characters amongst the free people of color who recently sailed from this port in the Brig "Rover." for Liberia. I then promised you in my next to give you some account of the emancipated slaves who sailed in the same expedition. This promise I will now endeavor to fulfil, and I will begin with the case of an individual emancipation, and then state the case of an emancipated family, and conclude with an account of the emancipation of several families by the same individual.

The first case alluded to is that of a young woman emancipated by the last will and testament of the late Judge James Workman, of this city, the same who left a legacy of ten thousand dollars to the American Colonization Society. Judge Workman's will contains the following clause in relation to her, viz:—"I request my statu liber, Kitty, a quarteroon girl, to be set free as soon as convenient. And I request my executors may send her, as she shall prefer, and they think best, either to the Colonization Society at Norfolk, to be sent to Liberia or to Hayti; and if she prefer remaining in Louisiana, that they may endeavor to have an act passed for her emancipation; if the same cannot be attained otherwise; and it is my will that the sum of three hundred dollars be paid to her after she shall be capable of receiving the same. I request my executors to hold in their hands money for this purpose. I particularly request my friend John G. Greene to take charge of this girl, and do the best for her that he can." Mr. Greene provided her with a handsome outfit, carefully attended to her embarkation, and the shipment of her freight, and placed her under the care of the Rev. Gloster Simpson.

The next case, alluded to above, is that of a family of eleven slaves emancipated for faithful and meritorious services, by the will of of the late Mrs. Bullock, of Claiborne county, Miss. Mrs. Moore, the sister and executrix of Mrs. Bullock's estate, gave them 700 dollars to furnish an outfit and give them a start in the colony.

The third and last case alluded to above, consisted of several families, amounting in the whole to 26 individual slaves belonging to the estate of the late James Green, of Adams county, Mississipi. The following interesting circumstances concerning their liberation, were communicated to me by James Railey, Esq., the brother-in-law and acting executor of Mr. Green's Estate. Mr. Green died on the 15th of May, 1832, the proprietor of about 130 slaves, and left Mr. Railey, his brother-in-law, and his sisters, Mrs. Railey and Mrs. Wood, executors of his last will and testament. Mr. Green's will provides for the unconditional emancipation of but one of his slaves—a faithful and intelligent man named Granger, whom Mr. Green had raised and taught to read, write, and keep accounts. He acted as foreman for his master for about five years previous to his death. Mr. Green, by his will, left him 3000 dollars, on condition that he went to Liberia, otherwise, 2000 dollars. Provision was also made in the will for securing to him his wife. Granger has been employed since the death of Mr. Green, until recently, as overseer for Mr. Railey, at a salary of 600 dollars per annum. Granger declines going to Liberia at present on account of the unwillingness of his mother to go there. She is very aged and infirm, and he is very much attached to her. She was a favorite slave of Mr. Green's mother, who emancipated her and left her a legacy of 1000 dollars. Granger came to this city with Mr. Railey to see his friends and former fellow-servants embark: and when he bade them farewell, he said, with a very emphatic tone and manner, "I will follow you in about 18 months."

The executors of Mr. Green's estate were by no means slack in meeting the testator's wishes concerning these people. Mr. Railey accompanied them to New-Orleans, and both he and Mrs. Wood, who also was in New-Orleans while they were preparing to embark, took a lively and active interest in providing them with everything necessary for their comfort on the voyage, and their welfare after their arrival in the Colony, and placed in my hand 7000 dollars for their benefit, one thousand dollars of which were appropriated towards the charter of a vessel to convey them to the Colony, with the privilege of 140 barrels freight—sixteen hundred dollars towards the purchase of an outfit, consisting of mechanics' tools, implements of agriculture, household furniture, medicines, clothing, &c., and the remaining four thousand four hundred dollars, partly invested in trade, goods, and partly in specia, were shipped and consigned to the Governor of Liberia, for their benefit, with an accompanying memorandum made out by Mr. Railey, showing how much was each one's portion.

I will close this communication by relating one additional circumstance communicated to me by Mr. Railey, to show the interest felt by Mr. Green in the success of the scheme of African Colonization. The day previous to his death, he requested Mr. Railey to write a memorandum of several things which he wished done after his death, which memorandum contains the following clause, viz:—"After executing all my wishes as expressed by Will, by this memorandum, and by verbal communications, I sincerely hope there will be a handsome sum left for benefitting the emancipated negroes emigrating from this State to Liberia; and to that end I have more concern than you are aware of."