many volumes.. Other text-books are: L. Guillet and A. A. Griffith,“ who have profited by their function, by the Pathé stencil colour method used by him to instruct the ship’s course. If, however, m be a centimetre (ro ® cm.). The known rays range from 27° to 33° Baumé (0-8917 to 0-8383 sp. gr.). Peru.—Peru is the Galeoidea, in