Аннотация:The paraprocess is investigated in rare- earth monocrystalline iron garnets (Y, E r, Ho, Dy, Tb, Gd) in the Curie-temperature region. The measurements establish that the paraprocess constant has a maximum value for Y iron garnet and diminishes upon replacement of Y by heavy rare-earth ions in the dodecahedral sublattice. The data obtained are explained on the basis of molecular-field theory, on the assumption that the exchange interaction of the rare-earth ions with the Fe ions is determined, in first approximation, not by the total but by the spin moments of the rare-earth ions.