a river, anciently called Grant, which, arising in Hertfordshire, runs north-east by Cambridge, and afterwards continues its course northwards, to the Isle of Ely, where it falls into the river Ouse.

CAMÆA, in natural history, a genus of the semipellucid gems, approaching to the onyx structure, being composed of zones, and formed on a crystalline basis; but having their zones very broad and thick, and laid alternately on one another, with no common matter between; usually less transparent, and more debased with earth, than the onyxes.

1. One species of the camea is the dull-looking onyx, with broad black and white zones; and is the camea of the moderns, and the Arabian onyx: This species is found in Egypt, Arabia, Persia, and the East Indies. 2. Another species of the camea is the dull, broad-zoned, green and white camea, or the jasper-cameo of the Italians: It is found in the East Indies, and in some parts of America. 3. The third is the hard camea, with broad white and chestnut-coloured veins. 4. The hard camea, with bluish, white, and flesh-coloured broad veins, being the sardonyx of Pliny's time, only brought from the East Indies.