176 
A, B, AAB ABA 2% ve iN 
the concentrations, moments of inertia, potential-energies and sym- 
metry-numbers being as follows 
€, €, Cs 
ove oib govern 
(51) 
0 0 ús x, big 
1 l 1 2 
The two reactions 
AABZA LB and ABA ZAL B . eS 
give dissociation-equations of the following form 
GPe TE 
since all the quantities are the same in the two cases with the 
exception of P, A P,y, Ax, and o, 0, (G is supposed to contain 
the quantities which are common to the two cases). 
If therefore for instance approximately P, = P, and 4, ==, we 
should have 
—s=2, » wae, 1 
or the concentration of the unsymmetrical molecules is about twice 
that of the symmetrical molecules. 
§ 9. Critical remarks on some allied deductions of the 
chemical constants. 
Whereas BorrTZMANN in his theory uses the equation 
SS =p oF 3. 0 
throughout, PLanck and many others following him replace it by 
the relation 
S= Plog Wo. Pee? re 
It was obviously Nernst’s theorem that first started this pre- 
ference of (60) over (59), as on the one hand it provided a natural 
zero-condition for the calculation of S and on the other a natural 
common unit for the estimation of W, viz. any condition of the 
system al 2 — 0: 
In the majority of calculations of the chemical constants a special 
obscurity remains as to the way in which the “thermodynamic 
probability” of a gas depends on the number of molecules. 
We shall try to explain in a few words, how this obscurity is 
