686 
here, which extends in the saturate solution up to 0,231 gr. mol. 
per liter and in the mixed crystal phase up to 1.947 gr. mol. per 
liter, is really a constant quantity. With greater concentrations the 
C 
quotient = presents a course as was also to be expected; the quo- 
S 
tient then becomes smaller, as the latter value indicates. 
Now that this result had been obtained, it was of course supposed 
that also on the dichlorine side the law of partition would prove 
valid. Mr. Meyer’s investigation yielded results in concordance with 
this expectation, which are recorded in: Table II. (see p. 685). 
C 
Here too only the quotient a yields values that vary only within 
S 
the errors of analysis over a definite range of concentration, viz. 
up to a dibromine concentration in the solution of 0,04 gr. mol. 
and in the mixed crystal of 0.72 gr. mol. Hence we may conclude 
that this quotient, which has of course another value than the 
corresponding quotient on the di-bromine side, is in reality a constant 
quantity. 
The results given here are of great importance. They justify us in 
concluding that also for the diluted component in a diluted mixed 
crystal GiBBs’s paradox will prove to be valid, and that we may, 
therefore, write for the equilibrium between a mixed crystal phase 
and a saturate solution: 
RT na, + F(v ‘ DD, =—— pall in Es + Q(v. Ie 
In a subsequent communication we shall see what conclusions 
may be drawn from the value of the factor v with regard to the 
molecular size of the diluted component in the mixed crystal phase. 
Meanwhile Mr. Meyer is carrying on the investigation with other 
substances, among which also electrolytes. 
Laboratory of general and inorganic Chemistry 
of the University. 
Amsterdam, May 28, 1920. 
