The larger species, as might be expected from their heavier build, are somewhat less strictly arboreal in their habits than the smaller ones.
The growth was heavier, however, in the E.
The smaller duff is separated by vibrating or rotating screens into a great number of sizes, which are cleaned by washing in continuous current or pulsating jigging machines, where the lighter coal rises to the surface and is removed by a stream of water, while the heavier waste falls and is discharged at a lower level, or through a valve at the bottom of the machine.
The very dense water of the Red Sea and the Mediterranean makes the column of water salter and heavier and the level lower than in the ocean beyond the straits.
Boards covered with canvas or sacking, the gold and heavier particles becoming entangled in the fibres.