Files are of various shapes

as flat, half-round, three-sided, square, or round, and are generally thickest in the middle, while their teeth are of various degrees of finene and of different forms. A file whose teeth are in parallel ridges only is called single cut or float-cut. Such are mostly used for bra and copper. When there are two series of ridges cro ing each other the file is double-cut, which is the file best suited for iron and steel. Rasps are files which have isolated sharp teeth separated by comparatively wide spaces, and are used chietly for soft materials such as wood and horn. Each cla of files is made in six degrees of finene , called rough, followed by middle, bastard, second-cut, smooth, and superfine or dead smooth, File-fish, a name given to certain fishes from their skins being granulated like a file; they constitute the genus Balistes. The orange file-fish or “ barnacle eater’? is common along the coast of New England.