( 1260 ) 
substances. Besides, also with regard to the relation I think I found 
in my paper of the preceding month between the critical quantities, 
3? 
V1Z. pt — 97 
to which value I concluded from SypNey Youne’s observations we 
calculate s = 4,04, while Youre gives 4,026 for it as determined by 
the observations. 
If we apply the formula (y) for the calculation of x, viz.: 
v vw, f—1 pv n—l wv vi. f—1 
= en me | meen EEn Kp - — 
v—bg v_ sm Ll n v—bg v sm 
we do indeed, meet with some irregularities for ethyl alcohol. 
, alcohol behaves in a normal manner. With /;,= 7.9, 
DV 
Thus for É- a same value equal to —— is given as weli at 0° 
RT 1.003 
<2 Wik 5.6: 
as at 10°, 20°, 30°, and 40°. For 0° — =—— = 0,00012, whi 
assat LO” 207, ANC 1 3 SE j , which 
i 
multiplied by ea is equal to 1,714 1,89 X 0,00012 = 0,00039, 
sm 
and which if we confine ourselves to thousandths, is too small to be 
n 
taken into account. At 0° we should then find 7 = 5 0,003. At 
n— 6 
ze Uk 3.63 : 
40°, when — has risen to ae should find « smaller and scarcely 
v t 
n 
0,001. But even if we should disregard this irregularity, it 
n— 
strikes us that at 40° w is evidently so much smaller for alcohol 
than it would be for ether in these circumstances and this suggests 
the thought that « descends more rapidly with the temperature for 
alcohol than it is the case for ether, or that perhaps it is smaller 
at all temperatures. 
The latter seems hardly to be the case at higher temperatures. 
Thus we find the value of the first member for alcohol 
at 130° equal to 0,044, whereas this value for ether for a volume 
that amounts to as many times the critical volume, which is the 
case between 60° and 70°, is equal to 0,05. At 190° the 1*t member 
assumes a maximum value, which is equal to 0,067, which maximum 
value is only little greater for ether. And this maximum value occurs 
for both substances at volumes which are about an equal number of 
times the critical volume. 
So our conclusion is that aleohol does not appreciably differ from 
the so-called normal substances as far as its saturate vapour volumes 
are concerned. But methyl-aleohol does behave in anormal way, both 
