A GEORGIA DOUGLAS MAN. – A letter appears in the Atlanta Intelligencer of the 13th inst. from the Hon. AUGUSTUS R. WRIGHT, the Democratic representative in Congress from the Fifth District in Georgia, in which the course of Senator DOUGLAS is fully sustained. Mr. W. is of the opinion that Mr. BUCHANAN and Mr. COBB might be better employed than in crushing out the Little Giant. The Secretary of the Treasury, he says, should let President-making alone till the proper time comes, and the President might profitably devote himself to carrying out the Monroe doctrine. But it is more than doubtful whether they will take Mr. WRIGHT’S advice.