Arrow rock is so called from its having been formerly resorted to, by the neighbouring Indians, for the stone used to point their arrows. It is a beautiful situation, and rises to considerable elevation above the water.[127] From its summit is a pleasing view of the river, and near the base is a remarkable eddy, which, as they were crossing, whirled their ferry-boat entirely round. On the second day they left their encampment at an early hour, and travelled forward through plains where very few trees were to be seen. They turned off from the Osage trace, in which they had been travelling, and went eight miles to visit the salt-works, and some remarkable diggings, on the saline fork of the Le Mine. Here, at one establishment, one hundred bushels of salt are manufactured per week; eight men are employed, and one hundred and eighty gallons of water are evaporated to produce a bushel of salt.[128]
Two miles from the confluence of the Camp Fork with the Saline, are the salt-works, and the residence of Mr. Lockhart, who received the detachment with much hospitality.
His works were not then in operation, but were sufficiently extensive for the manufacture of five hundred bushels of salt per week. Near his house are the _diggings_ so often mentioned in this region as objects of curiosity. These are irregular, but very numerous excavations of little depth, but evidently the result of the united labours of many persons who were possessed of instruments of iron and steel, as no others could have penetrated, and removed the compact rocky soil, of which the points and brows of the hills are composed. These excavations occur frequently { 94} in an extent of two or three miles; and from the amount of labour which appears to have been expended on them, it has been thought by some, that several hundred men must have been occupied two or three years in digging them; but this is, doubtless, much overrated. Whoever were the labourers; it is probable their search was for the precious metals, though at present no indications of any metallic ores, except of a little iron, are perceptible about the diggings. Mr. Lockhart had sunk a shaft to the depth of twenty-two feet, but the appearances continued the same as at the surface.[129]