We saw above that the two earliest kinds of currency consisted either of some article of absolute necessity, such as the skins of animals in the colder climates, or of some form of personal ornament, which being both universally esteemed as well as durable and portable will be readily accepted by all members of the community. It is of pre-eminent importance that it be universally esteemed. Travellers who have ignored this principle have found out its truth to their cost in Central Africa in modern times. As the chief currency consists of glass and porcelain beads, which the traveller must carry with him or starve, the European is too apt to assume that provided the beads are bright and gaudy in colour all sorts will be taken with like readiness by the natives. Sir Richard Burton in a valuable appendix to his _Lake Regions of Central Africa_ warns travellers against this dangerous error. The African has his own firmly rooted canons of aesthetics, and will take as payment only those sorts of beads which he considers suitable and becoming. Again, some explorers brought supplies of cheap Birmingham trinkets, thinking that they would captivate the negro eye, but they proved a complete commercial failure, for the natives much prefer trinkets and jewellery of their own manufacture, and which are more in keeping with their standard of good taste. Again, the Arabs of the Soudan will not take gold as payment, in consequence of which our army in the late expedition had to take with them large and inconvenient supplies of silver dollars, coined for the purpose. The Maria Theresa dollar is the recognised currency in that region, not because of any notions as regards currency properly speaking, but because the Arab’s taste lies in silver ornaments for himself, his weapons and his horse. He values then the silver because of its utility as an ornament, whilst gold he cannot employ to the same advantage. I have thus digressed in order that it may be clearly seen that mankind were not seized with the _sacra fames auri_ from the very first moment when the eye of some wild hunter or nomad first lighted on a gold nugget as it glistened under the sunlight in the stream. A considerable period may have elapsed after mankind became acquainted with gold or silver before man cast away his necklets or bracelets of shells such as have been found along with the most ancient remains of the human race yet discovered in Europe, and put on his person in their stead similar ornaments beaten out of the gold from the brook. It is perfectly reasonable to assume that the primitive Aryan or primitive Semite, who wore ornaments of shells, used these as instruments of barter, or even currency, in the same way as we have found the peoples of Asia and Africa using their strings of cowries, the aborigines of North America their wampum belts, and the Fijians their whales’ teeth.