the Elements Carbon, Boron, and Silicon, 



279 



Table (continued), 



Seventh Series. 



N Q =9-80. 



G. 



T. 



N. 



W. 



Co-T. 



1-250 

 1-242 

 1-240 



2741 

 273-6 

 271-9 



843-2 

 834-2 

 829-0 



86-04 

 85-12 

 84-59 



0-2511 

 0-2505 

 0-2509 



1244 



273-2 



835-5 



85-25 



0-2508 



Wf 3 ' 2 = 68-53- 



From the average results of these seven series of experiments 

 the following values for the specific heat of graphite are de- 

 duced : — 



Ay 

 Values~of -rm- 



y-50'3 : 



y-107' 



yio-g = 



w u ,,-w 



79-3 "-2i -^ (vnas 



57-9 



W 



o-o 



21-4 



21-4 



•TO21-6 



o-o 

 216 



^61- 



2/138-5 



3^201 -6 = 



v> o-o u o* 



774 



vv o-o " 



w o-( 



79-0 



•m225-3 w 178-0 

 Y 0-0 — w o-o 



47-3 



w 273-2__ w 225-3 



2/249,3 4T9 



L 0-000749. 



= 01437 J 



1 0-000777. 



=0 1604 J 



I 0000764. 



=0 1990 J 



1 0000715. 



=0-2542 J 



1 0-000672. 



=0-2966 * 



[ 0-000596. 



=0-3250 J 



Graphite, therefore behaves in a manner exactly analogous with 

 diamond; its specific heat notably increases with increasing 

 temperature. This increase shows an acceleration from —50° 

 to 0°; from 0° to 250° it diminishes. The curve of the specific 

 heat of graphite shows, therefore, a turning-point in the neigh- 



bourhood of 0°. The small change in the value of ^jj, when T 



is about =0°, makes it evident that great care must be exercised 



