Freestone Or Sandstone. That dug in the peninsula of Portland, and thence called Portland stone, is much used, being softer and whiter than Purbec stone, and is commonly raised out of quarries in bigger blocks ; some are also called ryegate or fire stone, freestone. Mr Boyle observes, that a competent knowlege of the stones used in building is of great importance; one stone dug out of a quarry being found to moulder away in a few winters, while another will brave the air for many ages. The same author adds, that, as there are some sorts of stones which will decay in a few years, there are others that will not have attained their full hardness in thirty or forty years, or even much more. Freestone is a whitish stone, dug up in many parts of England, that works like alabaster; but more hard and durable, being of excellent use in building. It is a kind of grit or fine sandstone, and is called freestone from its being of such a constitution as to be cut freely in any direction. This stone occurs In almost all countries, is of a reddish, yellow, white, or gray colour, and is sometimes mixed with small particles of mica, or vestiges of shells. It is used for grindstones, scythe-stones, shoemaker's whetstones, etc. and in buildings. Workmen constantly employed in cutting it, generally die of consumption in consequence of its fine particles being imbibed by the lungs. A kind of flexible grey sandstone is found in the Brazils. A coarse kind of sandstone is used for filtering water.