Iodine and Bromine above Critical Temperature. 429 



not precipitated when the solutions are heated ahove the 

 critical temperature, but remain dissolved in the vapour. 



I have made a rather hasty quantitative investigation of 

 this phenomenon, and have obtained curves similar to those 

 obtained for iodine and bromine by the optical method. An 



Fig. o. 



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Bromine in 0S 2 vapour. 



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ethereal solution of Hgl 2 , and an alcoholic one of KI, were 

 used. In the first case the tube held a solution so strong, 

 that when the contents became homogeneous above the 

 critical temperature, a portion of the salt was thrown down 



