or Muscovy, a large empire, comprehending a vast extent of country, in the most northerly parts of Europe and Asia, from 24° to 130° E. long. and between 45° and 72° N. lat.

Its capital cities are Moscow and Petersburg.

RUST OF A METAL, the flower or calx thereof, procured by corroding and dissolving its superficial parts by some menstruum. Water is the great instrument or agent in producing rust: and hence oils, and other fatty bodies, secure metals from rust; water being no menstruum to oil, &c. and therefore not able to make its way through it.

All metals are liable to rust, even gold itself, if exposed to the fumes of sea-salt.