the Elements Carbon, Boron, and Silicon. 



297 



Table (continued). 



Seventh Series. 



N = 6-030. 





G. 



T. 



N. 



W. 



Co-252- 



Silicon 



Tinfoil 



Platinum 



Silicon 



Tinfoil 



Platinum 



Silicon 



Tinfoil 



Platinum 



1-060 

 0321 

 0501 



1-080 

 0321 

 0-501 



1055 

 0-304 

 0-501 



1251-6 

 1254-8 

 1250-6 



4686 

 4740 

 426-5 



77-720 

 78-606 

 70-741 



f 0-1924 

 < 2134 



L 0-0329 



f 01920 

 I 0-2136 

 [0-0329 



f 0-1908 

 { 0-2133 

 [ 0329 



Mean 





252-3 







01917 





W 252-3 =48 . 366< 



From the values of Wj the following specific heats of crys- 

 tallized silicon are deduced : — 



W 



y-39-8 — 



-797 



797 



W 



42-13 

 00 



y21"6 = 



42 13 



y*r\ 



w 71-07 w 42-13 

 VY 0- YY Q0 



28-94 



01360 



= 0-1697 



= 01833 



yse-o = 



29-83 



w 156-6_ w 100-9 

 w 0-0 0*0 



71-07 



^!_ =0-1901 



yi287 "~ 



557 



w 



w 



156-6 



#184-3 = 



55-4 



W 



#232-4 



40-3 



= 01964 



= 0-2011 



0-2029 



Values of — f-. 

 Al 



0-000550 from -40° to +20°. 



0000382 from 20° to 60 \ 



0000235 from 60° to 90°. 



0-000148 from 90° to 130°. 



0000085 from 130° to 185°. 



0-000038 from 185° to 230 c 



From these experiments it is evident that the specific heat of 

 silicon is a function of the temperature, and that at about 200° 

 it attains a constant value. The variation in the specific heat of 

 silicon in the neighbourhood of 200° is not greater than the va- 

 riation in the case of the metallic elements. If the specific heat 



Phil. Mag. S. 4. Vol. 49. No. 325. April 1875. X 



