Automatic Envelopes

An envelope is on the European niarket which is closed without either gum or sealing wax, and it is said that it will hold tighter than either: When once it has been closed this new envelope can not be opened without tearing. The outer flap has a tongue, which on the inside has a plalt or fold. The tongue is inserted in a slot in the back flap, and, once in the plait catches the edge of the slot and can not be drawn. The harder one pulls the more firmly does the plait hold. In addition to the greater safety of this envelope, there is no trouble with gum. Both the new envelope and the machine for making it have been patented in Europe and America.