See that every letter, newspaper, or other packet sent by post, is securely folded and sealed. Every such packet has to be several times handled; and even when in the mail bag, is exposed to pressure and friction. Unless, therefore, the article be light and pliant, it should be enclosed in strong paper, linen, parchment, or some other material which will not readily tear or break.
Newspaper covers.
Fasten the covers of newspapers firmly, so as to prevent them from slipping out.
Letter Box.
When dropping a letter or newspaper into a letter-box, always see that the packet falls into the box, and does not stick in its passage.
Letters for hot climates.
Never seal letters for the East and West Indies and other hot climates, with wax. Such a practice is attended with much inconvenience, and frequently with serious injury, in consequence of the melting of the wax, and the adhesion
of the letters to each other. In all such cases use either wafers or gum, and advise your correspondents in the country referred to to do the same.
Letters containing money or value.
Never send money or other articles of value through the Post Office, except either by means of a money-order or in a registered letter. Carefully secure every letter or packet containing money or value, first with gum and afterwards with good sealing-wax, on which make the clear impression of a seal.