Neutron-wave propagation in the crystalline moderator, graphite, is studied by numerically solving the Boltzmann equation in the diffusion approximation. For each source frequency, the method employed (described in detail in Part I of this series) gives the fundamental mode eigenvalue and the corresponding neutron energy distribution. Various source frequencies in the range 10 to 500 cps have been considered and it is shown that a discrete mode exists for f < f ≈ 350 cps. The Pn coefficients and also the diffusion constant and diffusion cooling constant have been obtained and compared with experimental data. The agreement between our theoretical values of different parameters and the corresponding experimental data is better than what has so far been reported.