FREE STAMPED ENVELOPES. When the Bill for Cheap Postage was before Congress, it contained a clause authorizing the sale of stamps on the English system. The provision was however stricken out, leaving the public only the old method of prepaying letters during the business hours of the Post Office. A suggestion was made to our new Postmaster, Mr. Morris, that the public convenience would be very much promoted if he would sell envelopes which would pass free through his office. By this measure letters could be sent at any hour of the night to the post office and the postage paid, where the writer desires it, by enclosing it in a free envelope. The postmaster proposed to sell stamps at five cents each, but this not having been sanctioned by Congress, we should think would not be the best way, and as the public convenience demands something of the kind, we are glad to learn that he has prepared envelopes of the kind referred to, some of which we have seen. They are marked "Five Cents," and under these words is the name "R. H. Morris." For letters over one ounce they are marked according to the Post Office Rates in the same way. These envelopes will be sold by the Postmaster at six and a quarter cents each, or sixteen for a dollar of the common kind and common size. This will be as cheap or cheaper than they can be bought in small quantities at the stationers. A thin envelope will contain two letters and be subject only to a single postage. Envelopes of various sizes will also be furnished and of fine quality when desired by the purchaser. The plan we hear, has also been adopted by the postmaster at Washington, D. C., and has met the approval of the Postmaster General. We think it will add to the revenue of the Department very considerably. From the preceding extract we should infer that envelopes marked in some way "Five Cents," "R. H. Morris, P. M." had been issued and used at New York, and possibly something of the kind at Washington. The latter would be signed C. K. Gardner, P. M., but up to the present day none have been found. They must have been prepared at New York at least, since the editor of the Express claims to have seen them. They were probably made by some of the New York hand stamps noted as current at this time, leaving out the date and signed by the postmaster. Such an arrangement was clumsy and liable to abuse and could have had but a short duration in so large an office as New York, and in the Express of the 14th of July, 1845, appears another editorial as follows: