Comment on Nonlinear susceptibilities of granular matter'

The results of Stroud and Hui (SH) on the conductivity of weakly nonlinear media are shown to imply the scaling behavior of the critical current Ic, which marks the transition from linear to nonlinear behavior. Applying this idea to a specific system, we suggest a possible explanation of experimental results reported previously. The scaling behavior of Ic is also calculated for the case of a perturbed strongly nonlinear system.