Frauds in substitutes.
--The Marietta (Ga.) Confederate says Gen. Pillow has, in the progress of his investigations, detected a systematic organization for the fraudulent sale of substitute and exemption papers. It consists in an arrangement between a substitute broker and a standing substitute, and an officer in Mississippi, an appointee of the Chief Bureau at Richmond. The product of translucent transactions in the hands of the guilty parties, as far as discovered, amounts to over $19,000.