A short time since we mentioned the fact that a firm in Georgia had purchased at the Treasury Department, in this city, Confederate bonds to the amount of $1,000,000. An agent of the Government who is authorized to dispose of these bonds, writes us that a firm in Charleston, S. C. sometime ago, called upon him and purchased bonds to the amount of $1,500,000. This was done at a period when our prospects for independence were much less hopeful than at present, and when