the Elements Carbon, Boron, and Silicon, 



291 



great accuracy. The mean specific heat of the tinfoil used be- 

 tween 0° and T, C _t, was determined from a number of expe- 

 riments in which T varied from —21° to +200°, and was repre- 

 sented by the expression ' 



Co-t = 0-0533 + 0-00002346 T . 



After each experiment the crystals were removed from the tin- 

 foil vessel, dried, and placed in a new vessel. In the last expe- 

 riment, where the boron was heated to a temperature above the 

 melting-point of the tinfoil, a vessel of glass, the mean specific 

 heat of which from 0° to 263° was 0*2141, was employed. 



First Series, 







N = 



: 10-202 









G.. 



T. 



,. N. 



W, 



C-79-o • 





Boron 



Tinfoil 



Boron...... 



Tinfoil 



Boron 



Tinfoil 



0-667 

 0103 



0-667 

 0101 



0-662 

 0104 



-790 

 -79-4 

 -79-3 



1070 

 108-5 

 107-1 



-10-49 

 -10-58 

 -10 50 



01910 

 0-0528 



0-1918 

 00528 



0-1917 

 0-0528 



Mean 





-79-2 







01915 



W -79-2= 15 * 166 - 



Second Series. 

 N = 10-202. Co _ 53 . 



Boron 



TinfoU 



Boron 



Tinfoil 



Boron 



Tinfoil 



0-671 

 0-102 



0668 

 0100 



0-667 

 0098 



53-25 

 53-95 

 52-75 



89-5 

 91-1 



88-0 



8-794 

 8-931 

 8-628 



0-2379 

 00549 



0-2396 

 00549 



0-2371 

 00549 



Mean 





5 3-32 







0-2382 



Wf' 32 = 12-701. 



