RICHARDS. 



RETENTION AND RELEASE OP GASES. 



401 



in a research like the present one, in which the temperature could not 

 be made the sole issue of the experiment. Hence the melting point of 

 a pure salt is the safest possible standard. The following table gives 

 in parallel columns the salts chosen for the present scale of temperature, 

 with the results of the four investigations, and the values of the melting 

 points selected as the most probable. 



Temperature Scale. 



VOL. XXXIII. — 26 



