3362 INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [62 STAT. of a tag, preferably of parchment, to be securely attached. The same applies when stamping is likely to damage the article. ARTICLE 124. Articles assimilatedto samples. The following are admitted at the sample rate: Electrotypes, cut out patterns sent singly, keys sent singly, fresh cut flowers, articles of natural history (dried or preserved animals and plants, geological specimens, etc.), tubes of serum or vaccine and pathological objects rendered inoffensive by their mode of preparation and packing. Such articles, with the exception of tubes of serum and vaccine sent in the general interest by laboratories or institutions officially recog- nized, may not be sent for commercial purposes. Their packing shall be in accordance with the general regulations concerning samples of merchandise. ARTICLE 125. Groupedarticles. 1. The inclusion in a single packet of articles of correspondence of different classes is limited to commercial papers, to prints other than raised print for the blind, and to samples of merchandise, on condition: (a) That each article taken singly does not exceed the limits which are applicable to it in regard to weight and dimensions; (b) That the total weight does not exceed 2 kilograms per article; (c) That the postage paid is at least the minimum charge for com- mercial papers if the article contains commercial papers, and the minimum charge for samples if it is composed of prints and samples. 2. These provisions are applicable only to articles subject to the same rate per unit. When an Administration detects the inclusion in one and the same article of objects liable to different rates, that article is charged, for its total weight, with the rate applicable to the class for which the rate is highest. ARTICLE 126. Small packets. 1. Small packets are subject to the provisions laid down for samples of merchandise in regard to preparation and packing. 2. It is permissible to inclose therein an open invoice, reduced to its essential elements, as well as a simple copy of the address of the article with mention of the address of the sender. 3. The names and addresses of the senders shall appear on the outside of the packets. ARTICLE 127. "Phonopost" articles. 1. Subject to the provisions specially fixed for Phonopost articles, these shall be governed by the regulations applicable to letters.
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