a large river of Asia, which rises in the mountains which separate Tartary from India, and discharges itself into the India ocean.

**INERTIA of matter**, in philosophy, is defined by Sir Isaac Newton to be a passive principle by which bodies persist in their motion or rest, receive motion in proportion to the force impressing it, and resist as much as they are resisted. It is also defined by the same author to be a power implanted in all matter, whereby it resists any change endeavoured to be made in its state. See **MECHANICS**.