a 



of Cerium, Lanthanum, and Didymium. Ill 



further, the weight of the metal contained in 

 the glass envelope .... 

 and its specific gravity . . . s, M 



and the temperature and pressure of the air in the glass enve 

 lope when sealed t and P, we have 



(V 



Sg Sm J 



773(1 + 0-00366 00-760' 



(2) 



A. Specific Heat of Didymium. 

 The data for the calculation of G, from formula (2) were 

 V=l-17, i g =%% 



G ff =0-2445, ^=6-544, 



G = 1-844. t =40°, 



P =0-759; 

 and hence 



a, =o-ooo8o. 



The experiments with the ice-calorimeter gave : — 





Weight of 



didymium, 



in grms. ' 



Weight of 

 glass enve- 

 lope, in 

 grms. 



Weight of 



air in glass 



envelope. 



Initial tem- 

 perature. 



Duration of 

 the experi- 

 ment. 





G m . 



<v 



Qi. 



. t. 



M.-Mo. 



Exp. ... 

 Exp. II.... 



1-8440 

 1-8440 



0-2445 

 0-2445 



0-00089 

 000089 



99°-90 

 100°] 



50' 



70' 





Scale- 

 variation 

 before 

 experiment. 



Scale- 

 variation 

 after 

 experiment. 



Eetraction 

 of mercury, 

 in scale- 

 divisions. 



Eeduced 

 retraction. 





7Kq 



t 1 



Qo-Qr 



T. 



Exp. I. ... 

 Exp. II.... 



-0072 

 -0117 



-0-035 

 -0-090 



199-5 

 2047 



196-8 

 197-45 



The specific heat of didymium is accordingly 



From Exp. I. . . . 0*04649 

 From Exp. II. . . . Q-Q4557 



Mean . . . 0'04653 



