JBO ROYAL SOCIETY OF CANADA 



TABLE III. (Fig. 5). 

 Wuod Charcoal. 

 Multiply current by 613 x 10~^^ for amperes. 



Curves for non-absorption practically the same as that for 170°. 



The wood charcoal was contained in a glass bulb, and the tem- 

 peratures were measured by a platinum-resistance thermometer, as shown 

 in Fig. 3; i-q curves were taken at temperatures of 170, 16.1 and — 74.2 

 degrees Centigrade. The first temperature was obtained by heating 

 in the specially constructed oven mentioned before, and the last from a 

 mixture of solid carbon dioxide and ether. 



Wood charcoal, under ordinary conditions, is not a good absorber, 

 but the curves here show that it is affected by temperature in the same 

 way as the other charcoals. 



The following table, taken from Fig. 5, shows increasing absorption 

 with decreasing temperature. 



