SIO Reference 59-52. The purpose of this paper is to establish the theorem that at arbitrary fixed depths the diffuse attenuation function value and the distribution function value varydirectly (but not necessarily linearly) one with the other, in all steady state real plane-parallel media which are predominantly forward scattering. In this way we establish a useful criterion for the behavior of in-terms of the intuitively simpler concept. The theorem is expected to find its greatest use in natural hydrosols.
