ON THE HALOGEN HYDRIDES AS CONDUCTING SOLVENTS. 



133 



Fig. 8. 



each of which consisted of two concentric tubes, A and B, which were sealed 

 together at the top. The outer tube B was provided with the two side tubes C and D, 

 to one of which, C, the condenser was attached, the other being closed by a well- 

 fitting cork. The two thermometers were placed in A and A', and were held in 

 position by waxed corks. 



To carry out an experiment, a sufficient quantity of the liquefied gas was introduced 

 through the side tubes D and D' into the vessels B and B', both of which contained 

 beads to ensure steady boiling. In order to determine the quantity of solvent used 

 in making the solutions, the volume of liquid in one of the vessels was measured at a 

 definite temperature, or, if liquid air was available, the liquid was frozen and the 



