( 12184 
to the conclusion that it is too large. In two ways I have tried to 
determine /' and so also f. First of all by taking Ap, AT and p 
and 7’ between the two highest temperatures, and substituting into 
TAp : 
mr We find Ap=-6.611, AT=4.34, p=39,1515 
and 7’ = 145.34 and from this f == 5.66 — and in the second place 
TET | 
7 
and f=5.6. So the sudden increase in the value of f' does not 
exist. With f= 5.6 we calculate s = 3.29 — which lies exceedingly 
near the value 3.283 found. 
So in this case we have an almost perfect harmony between the 
the formula 7 = 
by calculating f' from — log,, a ik . Then we find 7’=2.425 
Pk 
Ss 
64 
formula which supposes Si 2 and the observation for a sub- 
stance with very low critical temperature. For one with a high 
value of s, viz. ethyl-acetate, for which s = 3.949 is put by SypNry 
Youre, we get as good an agreement if we put f between 7.6 and 
7.8, as was found above (p.1215). With f= 7.7 we find s = 3.977, 
while SypNEY YOUNG gives s = 3.949. 
Only for helium a very great divergence would be found. In the 
8, 
paper already mentioned in the discussion of Argon dr is put for 
helium. To this corresponds f=4 or f' = 1.7372 — while f' = 1.2 
is given as highest value. But then f=—4 is the lowest value for f, 
which is possible according to the equation of state — unless we 
should accept the perfectly inconceivable supposition that 4 increases 
with v. 
s° 64 
If we examine the validity of the relation fon ote 2.37 for 
the alcohols and acetic acid according to the observations of SYDNEY 
Youre, we are in the first place struck with the difficulty to derive 
the value of /;, with any certainty from the observations. For 
methyl-aleohol there is at the higher temperatures generally a great 
difference between the observations and the formula of Bror used 
by SYDNEY Youre -— differences which irregularly change their signs 
at temperatures which differ only 1 or */, degree. As probable value 
of 7, I have chosen 8.35. If the said relation between s aud # 
existed, s=4.17 would correspond to this, while SypNry YOUNG gives 
s== 4.559. For methyl-aleohol the same difficulty in the determination 
of f holds, for this substance I think I have to assume the value 8.5. 
According to the above relation s = 4.215 would correspond to this, 
