Sand, a genus of fossils, consisting of small grains of silici stones, which are insoluble both in water and acids; being t rent, and vitrifiable by intense heat. They are mixed with various matters, whence they acquire different colours; and are divided into white, red, yellow, brown, blackish, and green sand*.

This of extensive utility in the manufacture of glass ; a fine white sand, found ill the vicinity lynn, Norfolk, being empl making white and a coarse greenish sand for the common green or bottle-glass. It likewise an excellent manure for clayey land, in the proportion of from 40 to 50 loads per acre, and also for moorish soils, at the rate of 160 loads. The best for such purpose, is that known under the namc of Sia-sand, the good effects of which will be more evident, in proportion to its distance from high-water mark: next in quality, is that washed down by the rain on gravelly soils; but the worst sands are those which are dry and light, because they are liable to be drifted or blown about by every gust of wind.

Lastly, it was suggested a few years since by Dr. Struve, that rape, linseed, or other oils, might be divested of their colour, and also of any ill smell or rancidity, by simply agitating them in water mixed with sand ; a large proportion of the former being employed and changed for a purer fluid, as often as it becomes turbid. Dr. S. observes, that he employed this method with success on a small quantity of oil in a phial. We understand, however, that similar experiments have been made in Britain, but which did not succeed. Hence we are inclined to attribute such failure to a different, or impure, kind of sand used for that purpose ; and therefore advise those who wish to avail themselves of this hint, previously to wash and dry the sand ; next to submit it to the fire in a crucible; and, while red-hot, to pour it into pure water : by repeating this simple progress two or three times, a very soft, friable sand will be obtained, and which may be farther improved by triturating it in a glass mortar, together with water; afterwards washing, then suffering it to subside in a closed vessel ; decanting the fluid, and again drying it. Thus prepared, we venture to promise a successful result.