It was surrounded by a stone railing loo ft.
If 127 parts of iodine, which is an almost black solid, and loo parts of mercury, which is a white liquid metal, be intimately mixed by rubbing them together in a mortar, the two substances wholly disappear, and we obtain instead a brilliant red powder quite unlike the iodine or the mercury; almost the only property that is unchanged is the weight.
There is an important fishery in the river, and the harbour is accessible to vessels of loo tons burden.
The earliest system adopted for the collection of petroleum appears to have consisted in Early skimming the oil from the surface of the water upon Methods which it had accumulated, and Professor Lesley states, that at Paint Creek, in Johnson county, Kentucky, a Mr George and others were in the habit of collecting oil from the sands, " by making shallow canals loo or 200 ft.
The principle of this system consists essentially in the use of rotating hollow drilling rods or casing, to which is attached the drilling-bit and through which a continuous stream of water, under a pressure of 40 to loo lb.