When we turn to the torrid zone, where clothes are only an incumbrance and Nature lavishly supplies plenteous stores of fruits and vegetables, the chief objects of desire will not be food and clothing but ornaments, implements and weapons. Hence we find amongst the inhabitants of such regions in especial strength that passion for personal adornment, which is one of the most powerful and primitive instincts of the human race. Shells have from very remote times formed one of the most simple forms of adornment in all parts of the world. Shells which once perhaps formed the necklace of some beauty of the neolithic age are found with the remains of the cave men of Auvergne. Strings of cowries under their various names of _changos_, _zimbis_, _bonges_ or porcelain shells are both durable, universally esteemed, and portable, and therefore suited to form a medium of exchange, and as such they are employed in the East Indies, Siam, and on the East and West Coasts of Africa; on the tropical coasts they serve the purposes of small change, being collected on the shores of the Maldive and Laccadive islands and exported for that object. The relative value varies slightly according to their abundance or scarcity. In India the usual ratio was about 5000 to the rupee. Marco Polo found the cowry in use in the province of Yunnam. He says (II. p. 62, Yule’s Transl.): “In Carajan gold is so abundant that they give one Saggio of gold for six of the same weight of silver. And for small change they use the porcelain shell. These are not found in the country but are brought from India.” How ancient is their use in Asia is shown by the fact that Layard found cowries in the ruins of Nineveh. [Illustration: FIG. 2. Wampum (made from the _Venus mercenaria_).] Beyond all doubt the wampum belts of the North American Indians served the purpose of currency. They consisted of black and white shells rubbed down, polished and made into beads, and then strung into belts or necklaces, which were valued according to their length, colour and lustre, the black beads being the most valuable. Thus one foot of black peag was worth two feet of white peag. It was so well established as a currency among the natives that in 1649 the Court of Massachusetts ordered that it should be received as legal tender among the settlers in the payment of debts up to forty shillings[20]. [Illustration: FIG. 3. Al-li-ko-chik.]