275 
best to begin with the adjustment of these terms. The fairly great 
changes which these terms as a rule undergo, have but a slight 
influence upon the values of the initial coefficients, while, on the 
other hand, small changes made in the initial coefficients in the 
process of adjustment occasion appreciable alterations in the coefficients 
of the final terms, and so the adjustment of the values of the final 
coefficients would become more difficult than it is as a rule at small 
densities. 
In the case of argon the coefficients € and § need not be taken 
into account, for their values have been adopted from VII. 1.1) and 
consequently they have already been adjusted to the observations. 
Our calculations therefore began with the adjustment of D, which, 
as a glance at the values of D4 already published?) will clearly 
show, had to be done in a somewhat arbitrary manner. Some of 
these D4’s have been taken from VII.1. The values of Dy at the 
lower temperatures, which were very irregular, were now plotted, 
while for t=6 the Dy, value from VII.1 was included. In this 
way values of D4 or D were graphically smoothed, and then the 
deviations of these smoothed values from VII.1. were represented 
as functions of the reduced temperature by a linear equation 
AD = Ad,t + Ad, 
(in which 
AD =D. — Dv. 
Ad, = dia — Ovi. 
Ad, = Doa — Òo.viri) 
In this way di, and eq were calculated as functions of the redu- 
ced temperature, while 634, d4,, and 5, were taken from VILA. 
The values of D adjusted in this way were then converted into 
D4 and were used in the first place to get an idea of the mag- 
nitude of the corrections to be applied to the values of 5 and € so 
as to give the best possible agreement with the observations. When 
this was done we could then proceed to the adjustment proper of 
the values of B4 and C4, or rather of B and € according to the 
formulae (I). 
As can be seen from what follows, this process yielded values of 
the coefficients which, especially as regards the ® coefficient, did not 
differ much from those of VII.1. while, at the same time, a compa- 
rison with the experimental data of the reduced equation of state 
1) Suppl. N° 19 p. 18. 
2) Proc. Dec. 1910, Comm. N° 1185. 
