The Hon. C. G. Memminger, well known to the people of Richmond and Virginia, for the great ability and eloquence he displayed as the Commissioner of South Carolina to the Legislature of this State, left Montgomery on last Tuesday for Charleston, and arrived in this city on yesterday. He will proceed at once to organize the Treasury Department of the Government, which will go into operation almost immediately, as his great energy and untiring industry know no such thing as delay. He will be joined so on by his family, including the elegant and accomplished daughter, who graced our society with her presence during the winter of 1859.