The occurrence of well-stored caches in some of the ancient mounds of the Ohio valley, as well as their repeated discovery in other localities, accords with the idea of systematised industrial labour, and the storing away of the needful supplies for agricultural and domestic operations, and for war. Messrs. Squier and Davis, in their _Ancient Monuments of the Mississippi Valley_, describe one of the mounds opened by them within the great earthwork on the North Fork of Point Creek, in which, according to their estimate, about four thousand hornstone disks were disposed in regular order, in successive rows overlapping each other. In 1864, I had an opportunity of examining some specimens retained in the possession of Dr. Davis. They were mostly disks measuring about six inches long and four wide, more or less oval, or broad spear-shaped, and fashioned out of a fine gray flint with considerable uniformity of character. Mr. Squier assumed that the deposit was a religious offering; but subsequent disclosures of a like character confirm the probability that it was a hoard of material stored for the tool-maker.[31] In other, though rarer cases, the cache has been found containing finished implements. In digging a cellar at Trenton, New Jersey, a deposit of one hundred and twenty finished stone axes was brought to light, at a depth of about three feet below the surface. Another discovery of a like character was made when digging for the construction of a receiving vault of the Riverview Cemetery, near Taunton; and similar deposits are recorded as repeatedly occurring in the same state.[32] In two instances all the specimens were grooved axes. In another, fifty porphyry celts were found deposited in systematic order. Mr. Charles Rau has given the subject special attention, and in a paper entitled “Ancient Aboriginal Trade in North America,” he furnishes evidence of addiction to certain manufactures, such as arrow heads, hoes and other digging tools, spear heads, chisels, etc., by skilled native craftsmen.[33] Deposits closely corresponding to the one reported by Mr. Squier as the sole contents of one of the mounds, in “Clark’s Work,” Ohio, have been subsequently discovered in Illinois, Wisconsin, and Kentucky. One of the Illinois deposits contained about fifteen hundred leaf-shaped or rounded disks of flint arranged in five horizontal layers. Another, said to have contained three thousand five hundred specimens, was discovered at Fredericksburg, in the same state. A smaller, but more interesting hoard was accidentally brought to light in 1868, when some labourers in opening up a new street, at East St. Louis, in the same State of Illinois, came upon a collection of large flint tools all of the hoe and shovel type. There were about fifty of the former and twenty of the latter, made of a yellowish-brown flint, and betraying no traces of their having been used. Near by them lay several large unworked blocks of flint and greenstone, and many chippings and