395 Round the dark roots, rent bark, and shatter'd boughs, From ocherous beds the swelling fountain flows; With streams austere its winding margin laves, And pours from vale to vale its dusky waves.

Hitherto it has been found that of all the appliances and methods for separating the liquid from the solid matters, whether it is in the case of effluents from tanneries and other manufactories, or the ocherous and muddy sludges taken from the settling tanks in mines, some of which contain from 90 to 95 per cent.