G. F. Nesbitfc, Esq., has shown to the Postmaster General an embossed stamp for prepaid envelopes, which has been accepted, and the manufacture will at once proceed. Such, however, is the labor and care required for their production, that none will be ready for delivery before the middle of next April. The " Minnesota Pioneer " statfes that there are in that vicinity vast bodies of beautiful white sand, from which a superior article of ass may be manufactured.