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INTRODUCTION Mention may be made of the devices used by Samoyedes (Fig. 10, 3). or in primitive trade exchanges of North American Indians, in Sumatra,
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Fig. 1-Aroko or symbolic epistles of the Yoruba people 1, Two cowries, strung back to buck (message of reproof for non-payment of debt), 2, Two cowries, face to face, followed by one above, facing upwards (message from a creditor to a bad debtor). 3. Four cowries, in pairs, face to face message of good will from a native to his brother abroad, asking for a personal interview). 4. Six cowries, face to face (message from a general of the Jebu force to a native prince abroad). 5. Letter from a native prince of the Jebu Ode, to one of his cousins abroad. 7. Message from the king Awnjale, to his nephew abroad. 8, Message of peace and good news from the king of Jebu to the king of Lagos, after his restoration to the throne, on the 28th December, 1831.
