1237 
ratus being sealed as soon as it is filled. Much preliminary work 
showed us the importance hereof; rubber stoppers are attacked by 
carbon disulphide, corks cannot be used, because the methylalcohol 
absorbs water from them; when using ground stoppers or taps, 
one experiences difficulties with the lubricants. 
The substances used were carefully purified. The purest commercial 
carbon disulphide was shaken with mercury, left for some time on 
quick-lime and distilled off. Finally it was distilled once more, all 
these operations being performed at red light. It was kept continually 
in the dark. The boiling point was 46.4° at 760 mm.; it did not 
stick to the condensor and had hardly any, in any case only a not 
disagreeable ethereal odour. 
The methylaleohol, also the purest commercial product, was treated 
with iodine and natron, boiled afterwards with quick-lime, left for 
some time on sodium and distilled off. At last it was fractionated, 
and the fraction, which distilled between 64.5° and 64.6° (760 mm.) 
was separately received. It was absolutely free from water, as was 
proved by the well-known reaction with anhydrie coppersulphate. 
The salt itself remained- perfectly white, while part of it dissolved 
slowly with a light-green colour. 
In table 1 (p. 1234) and fig. 4 (p. 1235) the results as to the 
components themselves and the triple curve are given. The points 
of the latter are determined with different mixtures; they all fit 
very well into the curve. 
The measurements, relating to different mixtures above their 
solution point are joined in table 2. It appears that the pressures of 
most mixtures are nearly equal, and that the pressure curves run 
so closely to each other that we had to refrain from joining them 
in one figure. Instead thereof, we have construed for a number 
of temperatures the p‚rv-diagrams, by interpolating on the different 
curves the pressure values corresponding to those temperatures. 
The result showed it to be impossible to realize in this system 
the transition sought for. Until just below the critical point, which 
we found at 37.4°, the p,c-curve retains the shape of fig. 2, in which 
the triple pressure is the highest (fig. 5, (p. 1238) that is given as 
an example for 35°). The form is very remarkable: the liquid 
branches change almost imperceptibly into the horizontal line, as 
is already known indeed for other systems with partial miscibility ; 
a maximum however is not to be observed. 
The curves for temperatures above the critical point might happen 
to give some decisive answer to the question. 
If there had been a distinct transition from the curve of fig. 2 
19e 
