Questions for those who've read Einstein's photoelectric effect paper.

I have some questions regarding the first two sections Einstein's paper. I'd
really appreciate some guidance.

The paper can be found here:
http://lorentz.phl.jhu.edu/AnnusMir...les/eins_lq.pdf

In section 1 of the paper, he considers a volume of gas surrounded by
reflective walls. He goes on to derive what seems to me to be the
Rayleigh-Jeans law using "Maxwell theory" and "kinetic gas theory":

http://www.physicsforums.com/latex_images/61/617770-0.png

R/N = k (boltzmann constant) and L = c

Then in section 2... he writes:
"We shall show in the follow that determination of elementary quanta given
by Mr. Plank is, to a certain extent, independent of the theory of
"black-body radiation" constructed by him.

He writes Planck's formula:
http://www.physicsforums.com/latex_images/61/617770-1.png

and then shows that at large T/v (v is frequency) this leads to the rayleigh
jeans law.

It seems like what Einstein's showing is... first...
"maxwell theory" and "kinetic gas theory" => Rayleigh Jeans Law
then
"planck's formula" => Rayleigh Jeans Law

Is this to demonstrate that Planck's formula is not just applicable to
blackbodies? But I thought both of these were already known. It seems to me
that there is something significant Einstein's getting at here, but I'm
missing it.

I'd appreciate any help.


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