Kenneth wrote:
> 
> I could be wrong, but I think that there is only one "size" of partical in
> MEDIA. (And personally, I'd like to know what size that is, for future
> reference. I don't see that in the POV docs anywhere. Perhaps it's just a
> mathematical "point" with no size at all.)
> 

As far as I understood the concept and implementation of scattering 
media in POVRay is, that there is no size at all. Instead there are 
empirical scattering function derived for certain aspects and different 
types of scattering media.
I think for scattering to occure the structure (size) which interacts 
with the light have to have about the dimensions of the wavelength of 
the light.

... dave

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