[maass- VAPOUR PRESSURES OF THE HALOGEN HYDRIDES 69 



mcintosh] 



The results of the measurements are given in Tables 1, 2, 3, and 

 4, and are shown in the curves (Fig. 3). The measurements, except 

 in the case of hydrochloric acid, have been continued far below their 

 freezing points. It will be noticed that the change in curvature at 

 the melting-point is slight. 



Table 1. 

 Hydrochloric Acid. 



Table 2. 



Hydrobromic Acid. 



