Abstract
The magnetic properties, in static fields, of the rare earth garnets are described. The Néel molecular field theory of ferrimagnetism is extended to treat three sublattices of magnetic ions and is shown to account quantitatively for the observed properties. At low temperature, the magnetic moments of those rare earth ions which have nonzero orbital angular momentum, are much less than the moments of the free ions. This is due to the quenching of the moments of the rare earth ions by the crystalline field.