37 



from which appears that it was not perfectly pure, but that it con- 

 tained a trace of a more volatile component vvhich pretty quickly 

 disappears when the liquid is boiled, so that after ^ 74 l^^s eva- 

 porated a boiling-point is found which is constant within the errors 

 of observation, viz. ± 131.3°. 



After these determinations the liquid was examined which at 

 20° had been in contact with Cdlj for six weeks. In the determi- 

 nation of the boiling-point in the way described just now the fol- 

 lowing result was obtained, the experiment being repeated 18, 

 resp. 19 times with the same filling. 



From these experiments it appears with the greatest clearness that 

 by the contact with Cdl^ at 20° the boiling-point of the methylrho- 

 danide is lowered by an amount of at least 7°. 7 (1st bulb), but at 

 the same time the course of the boiling point shows that on conti- 



