( 662 ) 
and using MAXWELL’s theorem : 
Wz 
ce nd = Tm (@,—®); 
Wi 
and: 
nS Aim 
jk (5,) e= ij oen 
wi 
where zr represents the reduced co-existence pressure, @, and @, 
reduced volumes of saturated vapour and liquid, then, if @ and @ 
: MRT. 
have the value mentioned before, and C, = dE we find 
Pk Vk 
et 1 © din 1m (@,—@ 
Pa vt = ie EH 5 Ve a 
MRI GAN ‘thn! BE \ T 
or 
PiP Ne T dpm N Pm (vg—?) a (4) 
Mee Th ean ORT 
1) Comp. Communication N°. 75, Proceedings Dec. 1901, p. 298. 
2) HARTMAN, Thesis for the Doctorate, Leiden. p. 104. 
As an addition to the graphic representation given in Comm. 43, Proceedings June 
1898, we give here the numbers found by HARTMAN, where « = the ratio of carbon dioxide: 
Co-existing phases at 9.5° C. 
Pp | Tj 
Vg vj Vg 
| 
3.58 0 | 0 0.00256 | 0.173 
0.021 0.242 257 145 
10 136 640 262 0813 
15 267 745 252 0562 
20 394 810 248 045% 
25 534 861 246 0356 
30 675 908 251 0269 
35 800 947 248 0209 
40 0.910 0.980 245 0166 
43 64 4 1 1 0.00243 0.0145 
OEE EE ARNT EEE. VENEN ee wey Ai ee EE 
The volumes of the vapour-phase are very uncertain; probably the blowing off, 
which was necessary before the analysis, produced a systematical error, HARTMAN 
