(1)A pattern or sample packet shall be posted without a cover, or with a cover at both ends, or in an unfastened envelope or other cover which can be easily removed so as to admit of a ready examination of the contents.(2)Samples of seeds, drugs and other articles which cannot be sent in unfastened or removable envelopes may sent enclosed in boxes or bags, provided that they are fastened in such a way that they can be easily opened, they may also be sent in airtight cases, when necessary, provided that the nature of the contents is certified on the cover under the full signature and address of the sender.(3)Articles of glass or other fragile material shall be securely packed (in boxes of metal, wood, or strong corrugated cardboard) in such a way as to prevent all risk of injury to the mails or to the officers of the Post Office.(4)Liquids, oils and substances which easily liquefy shall e enclosed in receptacles hermetically sealed. Each receptacle shall be placed in a special box of metal or of strong wood or of strong corrugated cardboard containing saw-dust, cotton, or spongy material in sufficient quantity to absorb the liquid in case the receptacle be broken. The lid of the box shall be fastened down in such a manner that it will not easily be detached.(5)Fatty substances which are not easily liquefied such as ointments, soft soaps, resin, etc, shall be enclosed in an inner cover (box, bag of linen or parchment, etc), which shall itself be placed in a second box of wood, metal or strong and thick leather.(6)Dry powders, whether dyes or not, shall be placed in cardboard boxes, which themselves shall be enclosed in a bag of linen or parchment.(7)Live bees shall be enclosed in boxes so constructed as to prevent all danger and to allow the contents to be ascertained.
