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During the process of weaving it is impossible to avoid getting yarn dirty and somewhat greasy, and the scouring necessary to remove this dirt impairs the color used in weaving. The genus is still better known as a Silurian form, but the spinose species appear to belong exclusively to the "Lower Devonian," and are found in Britain, Europe, and the Cape of Good Hope. Turn the Cheese every day, and put to it fresh of whatsoever you keep it in. Bullock carts, railroads, boats and steamers bring it at last to one of the world markets, Singapore, Colombo, London, Amsterdam or New York, where it is bought by dealers, and then sold to factories which make rubber goods. Others may be due to ignorance of detail on the part of the secondary copyist--the man who prepared them for publication--so that he was unable to follow up the clues on the drawings laid before him. This may be done by inspection or by means of a pick-glass and needle. Should quite a bluish shade be desired, a drop of diluted aniline green added will produce the desired result.