An opinion is hazarded by some, but proved by none, that moral urgencies are not sufficient to induce the negro to labor; that nothing can do this but physical coercion. But this a problem which the present age alone is prepared to solve by experiment. It would be a solecism to suppose a race or animals created, without sufficient foresight and energy to preserve their own existence. It is disproved, too, by the fact that they exist, and have existed through all the ages of history. We are not sufficiently acquainted with all the nations of Africa, to say that there may not be some in which habits of industry are established, and the arts practiced which are necessary to render life comfortable. The experiment now in progress in St. Domingo, those of Sierra Leone and Cape Mesurado, are but beginning. Your proposition has its aspects of promise also; and should it not fully answer to calculations in figures, it may yet, in its developments, lead to happy results.[88] VI Jefferson believed that the emancipation of the slaves could be effected by legislation. To this end he made several noteworthy efforts. In 1776 he submitted to the revolutionary convention in Virginia a constitution in which was incorporated the clause prohibiting slavery. He undertook also to induce the legislature of Virginia to take this step in 1783, and as chairman of the committee of the Congress of the Confederation appointed to draw up an ordinance for the government of the Northwest Territory, he submitted a plan providing that after the year 1800 neither slavery nor involuntary servitude should exist there. These clauses and some comments thereon follow: No person hereafter coming into this country shall be held within the same in slavery under any pretext whatever.--Proposed Va. Constitution.[89] The General Assembly (of Virginia) shall not have power to ... permit the introduction of any more slaves to reside in this State, or the continuance of slavery beyond the generation which shall be living on the 31st day of December, 1800; all persons born after that day being hereby declared free.[90]--Proposed Constitution for Virginia. After the year 1800 of the Christian era, there shall be neither slavery nor involuntary servitude in any of the said States, otherwise than in punishment of crimes, whereof the party shall have been duly convicted to have been personally guilty.[91]--Proposed Ordinance of 1784.