AT HIGH PEESSURES BY OPTICAL METHODS. 
135 
point Ijy pressure continues at high pressures to be linear as it is at low pressures. 
This slight decomposition of CBr 4 at temperatures above that of the melting-point at 
Table I. 
Temperatures 
(corrected). 
Pressures, Pi 
(corrected). 
Pressures, P 2 
(corrected). 
° 0 . 
94-84 
45 kg./cm.^. 
65 kg./cm.“. 
97-84 
98 „ 
— 
100-29 
134 „ 
160 kg./cm.2. 
104-92 
274 „ 
295 
104-87 
280 
295 „ 
(110-94 
420 „ 
440 „ ) 
(115-48 
630 
- ) 
ordinary pressures is not surprising, since it is known that CBr^ decomposes on 
distillation, and that the carbon tetraiodide decomposes even when only just melting. 
It is, therefore, not probable that the increased pressure plays any part in producing 
this decomposition, although this, of course, cannot be proved. 
