( 506 ) 
the liquid phase alone. From some calculations, however, it appears 
that the composition of the liquid corresponds fairly well with the 
total-composition '), so that the curve representing our results graphi- 
cally does not differ much from the projection on the ¢, v-plane of 
the liquid-branch of the three-phase line, when we call to mind the 
p,t,@ model in space of BaKnuis RoozrBoom. In any case, the con- 
clusions as to the existence of compounds which we can draw from 
the course of the curve, remain unaltered. 
In the subjoined table our figures are united whilst in the annexed 
drawing they are represented graphically ; it should be observed that 
the composition is expressed in mol. percentage of Br. 
en ka melting point. Initial melting point 
0.0 — 87.39 
42, — 88 — 940 
3.3 — 91 — 95 
9.6 — 73.5 — 95.5 
17.4 — 61.5 — 96 
31.6 — 48 | — 93 
41.0 — 41.5 — 95 
50.5 — 355 
55.8 — 32.5 
69.0 — 24.5 
77.6 — 19.6 
87.7 — 13.4 
The drawing, as will be noticed, does not leave the least doubt; 
bromine and hydrogen bromide do not form a single solid compound. 
It has not yet been decided whether the solid phases which are 
deposited, consist of pure bromine and pure hydrogen bromide or 
of mixed crystals; in the latter case there is a discontinuous series as 
at about —95° a eutectic point was observed. 
Some experiments on the composition of the liquid and vapour 
phases at a pressure of one atm. render it highly probable that a 
compound of the type HBr, does not occur in the liquid or the 
1) Only in the case of one tube — 77.6"/, Br, — the deviation might amount 
to about 2°, at least under a pressure of 5 Atm.; with the others it amounts 
to at most 1/3 %o. 
