SATURDAY* JULY 16. 1843/The naval vessels Austin and Wharton, under Com1modore Moore and Capt. Lothrop, with Col. Morgan, arrived yesterday from Yucatan.The volunteer companies and a large concourse ofcitizens fumed out to welcome tbeir return.The whole of the Mexican forces have left Yucatant—the last having gone off unexpectedly in the night.We were unable to learn any additional news of importance by thig arrival.speech* wish t hiin the I holders Abolitic the Sot; Great IThe.after pathe subi*‘•Our try. andThe New Orleans papers contain some statements relative to the breaking of the levee auj overflow of the Mississippi above, but of such a character as tocere de slaveholO'Connt of the 8lt; municat