276                       PRECIOUS STONES.
	cutting, such as that of Mr. Coster at Amsterdam. Before revolving steel disks, that are running scrupulously parallel with the floor, and turning noiselessly with a speed of two thousand revolutions to the minute, are numerous workmen intent upon their task.
	The eyes of these polishers seem of little use compared with their sense of touch, which has been exquisitely educated. It is by the instinct of their finger-ends that the point of the diamond—kept constantly wet with mingled diamond-dust and olive-oil—is adjusted with determinate exactness of
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