  Starting from the assumption that ferromagnetically correlated regions exist
in manganites even in the absence of long-range magnetic order, we construct a
model of charge transfer due to the spin-dependent tunnelling of charge
carriers between such regions. This model allows us to analyze the temperature
and magnetic field dependence of resistivity, magnetoresistance, and magnetic
susceptibility of phase-separated manganites in the temperature range
corresponding to non-metallic behavior. The comparison of theoretical and
experimental results reveals the main characteristics of the phase-separated
state.
