  The Boltzmann - Langevin approach is extended to calculations of third and
fourth cumulants of current in diffusive-metal contacts. These cumulants result
from indirect correlations between current fluctuations, which may be
considered as "noise of noise". The calculated third cumulant coincides exactly
with its quantum-mechanical value. The fourth cumulant tends to its
quantum-mechanical value $-e^3I/105$ at high voltages and to a positive value
$2e^2T/3R$ at V=0 changing its sign at $eV \sim 20T$.
