1. On a tag, or the paper on which the address is written, the sender of third class matter may write "from" and add his own name and address. 2. On the blank leaf of a book, forwarded as third class matter, the sender may write a dedication or inscription, but it must not be in the form of a letter. 3. Fourth class matter must be so wrapped that the postal authorities can examine the contents without much trouble. 4. Such articles as glass, nails, needles or other matter that might work injury if it came loose, must be enclosed in two separate wrappings, or a double case. 5. Poisons, explosives, inflammable substances, and live animals are excluded from the mails. 6. Firearms may only be sent in detached parts. 7. All alcoholic liquors are regarded as explosive.
FOREIGN RATES
The rates to Canada are the same for all classes of matter as in the United States, except that seeds, scions, bulbs, cuttings, and roots are one cent per ounce.
To Cuba all the rates are the same as for domestic matter.
Rates with Mexico are the same as if mailed between our own states. Packages are limited to 4 pounds 6 ounces, except that single books may weigh more. Merchandise must be sent by parcel post.
To all other countries, in what is known as the "Postal Union", the rates for letters are five cents for each half ounce or fraction thereof.
Postal cards two cents each, double four cents.
Registration fees or letters or other articles, four cents each.
Ordinary letters for foreign countries, except Canada, Cuba and Mexico, must be forwarded, whether any postage is paid on them or not.
All other mailable matter must be prepaid.