Critical Phenomena of Ether. 



805 



through the side tube, with an arrangement for maintaining 

 constant the internal pressure (v. Appendix). 



The liquid used in the vapour jacket was aniline. For this 

 purpose Kahlbaum's Aniline was redistilled and the middle 

 fraction was employed. The temperatures were obtained 

 from the vapour-pressure readings given by Travers and 

 Usher (7). In the few cases in which these readings were 

 exceeded, it was considered sufficient to extrapolate the given 



Fig. 4. 



values, since in those cases an approximate temperature 

 sufficed for the purpose. 



The tube F was sufficiently wide to accommodate two 

 experimental tubes side by side, and where comparisons are 

 made between two tubes, the tubes were heated simultaneously, 

 so that the conditions of temperature were identical. 



