The name of the writer or firm, written or printed on the letter, is an advantage in case of miscarriage.

When a valuable letter is missing from any cause, the fact should be at once reported to the post master, in writing, with full particulars, and a search made by the complainants, of the pockets of any spare over-coats about the premises.

Where letters are delivered by a public letter carrier, or penny post, a locked box or some other safe place of deposit for the letters thus left, should be provided. A neglect of this precaution, is the cause of many annoyances and losses.

The address of letters intended for delivery in cities, should include, if possible, the occupation, street and number of the party addressed.

When a letter is, by mistake or owing to a duplicate name, delivered to the wrong person, it should be immediately returned to the post-office with a verbal explanation, and not be dropped into the letter box. If inadvertently opened by the party taking it from the office, the fact should be endorsed on the back of the letter, with the name of the opener.

Experience has shown that locked letter boxes or drawers opening on the outside, especially in cities and large towns, are unsafe, as depositories of letters, especially those containing articles of value.

No letters should be given to Route Agents upon the cars or steamboats, except such as cannot be written before the closing of the mail at the post-office. Under no circumstances can Route Agents receive letters that are not pre-paid by stamps.

When there are good grounds for believing that letters are opened and read from motives of curiosity, complaint should be made in writing to the Chief Clerk of the Post-Office Department, Washington. A secret plan for the certain detection of prying delinquents has recently been devised.

Two or more letters directed to different persons, cannot be sent by mail in one envelope or packet, without subjecting the sender to a fine of ten dollars. This does not apply to any letter or packet directed to a foreign country.