Matter of the first class may be forwarded until it reaches the addressee. All other classes require prepayment of the original postage before forwarding.
WHAT CANNOT BE MAILED
All transient second-class matter and all matter of the third or fourth class not wholly {133} prepaid, and letters and other first-class matter not prepaid are full rate — 2 cents.
All matter weighing over 4 pounds, except second-class matter, single books, and documents printed and circulated by authority of Congress.
Postal, post, or other cards mailed without wrappers and all matter bearing upon the outside cover or wrapper any delineations, epithets, terms, or language of an indecent, lewd, lascivious, obscene, libelous, scurrilous, defamatory or threatening character, or calculated by the terms of manner or style of display, and obviously intended to reflect injuriously upon the character or conduct of another.
Post cards bearing particles of glass, metal, mica, sand, tinsel, etc., are unmailable.
All matter concerning any lottery, so-called gift concert, or other enterprise of chance, or concerning schemes devised for the purpose of obtaining money or property under false pretenses.
CONCEALED MATTER
For knowingly concealing or inclosing any matter of a higher class in that of a lower class, and depositing or causing the same to be deposited for conveyance by mail at a less rate than would be charged for both such higher and lower class, the offender will be liable for every such offense to a fine of $10. {134}