Reynolds — Report on Glucinum. 735 



«4' (^^ 



when S represents the specific heat, H the atomic heat, and A the 

 atomic weight of an element. The specific heat of glucinum thus 

 calculated is -642. 



If now we substitute for H a constant, which in this case is the 

 product of the well-ascertained atomic weight of silver*'' into its equally 

 well determined specific heat, A S = 6" 157, the expression becomes 



s^^. (.) ' 



and with its aid we can calculate the specific heat of any solid element, 

 if its atomic weight is known or assumed. I have thus calculated the 

 specific heat of glucinum on the assumption (a) that its atomic weight 

 is 9'2 ; (h) that its atomic weight is 4-6, and (c) that it is 13-8. 



The results are compared in the following Table with the specific 

 heat obtained by calculation from the actual determination of the 

 atomic heat of the metal : — 



Specific heat of glucinum calculated (1) from the result of deter- 

 mination of atomic heat. 



When A = 9-2, -642. 



Specific heat of glucinum calculated by (2), 



When A = 9-2, .... -669 

 When A = ^-G, .... 1-338 

 When A =13-8, .... -446 



I am, therefore, justified in concluding that the atomic weight of 

 glucinum is nearly if not exactly 9*2. 



* "We miglit otviously take any otlier product, but tliat of silver is here pre- 

 ferred because the atomic heat of that metal has been employed as the standard for 

 reference. 



R. I. A. PROC, SER. II., VOL. II., SCIENCS. 3 X 



