From the returns of the commissioners of revenue in all the counties and towns in the State, except Spotsylvania, Fluvanna, Buchanan, Accomac, and the city of Lynchburg, from which counties there were no returns, there appears to be 73,004 male negroes over the age of twenty-one, which multiplied by 4.5, would show a black population of 328,518. Add 12,000 for the counties and city from which there are no returns, and we have as the entire population of the State on the 1st of February last 340,519. The Rule of Multiplying the adults by the sum 4.5 was adopted by Mr. Bennett, late Auditor of the State, and found to be correct.

In 1860 the whole negro population, including free and slave, within the present limits of Virginia, was 531,000. Comparing this with the amount of the same population in February, we discover that there has been a loss in the numbers of blacks in Virginia of upwards of 190,000! If their diminution has continued in the same ratio since the first of February as from 1860 to that time, the number of negroes now in Virginia cannot be much over 300,000. This is a terrible result of emancipation to these people.

A very remarkable fact developed by the same returns is that the adult male white population of Virginia was larger in February last than it was before the war. While the negro population has fallen off with a fearful rapidity, the white Virginians have been increasing in the face of calamities of war and of partial famine.

It is true that a number of negroes left Virginia during the war, but not enough to explain the immense falling off in their numbers.--Richmond Dispatch