( 233 ) 



If we put = o'. we find 



^ (1 + .) (1 _ b) (1 + at) 



If r = CO we find for the increase of volume in consequence of 

 the causes which make a substance deviate from the law of Boyle, 

 the value a' — b. 



If we had not solved the problem in general, but had restricted 

 ourselves to a first approximation, we should have found this 

 special value («' — b) as apparently the general one. So in mv paper 

 on „variation of volume and of pressure in mixing" I have found 

 for hv 



but only because the value of Av had been determined bv approxi- 

 mation — and the question is not without interest, can the real 

 course of Av be determined ? For the quantity v' — v for which the 

 accurate value has been found above, this may of course be done 

 — and it will be possible to show that a similar course is to be 

 expected for Av 



If we proceed to the discussion of 



a' b 

 a' — b — 



a' a' b 



we first observe that for v = -; the quantity v' — i- = 0. This 



a — b 



is the same value for which the quantity p — p', treated in my 



former communication, is equal to 0. 



