124 Sir James Dewcir. The absorption, etc., of Gases [June 15, 



is about 14-5 c.c. per calorie), we get the actual thermal evolution 

 together with the volume of gas absorbed. 



The heat correction for the rush of gas into the same exhausted 

 glass bulb without charcoal is small in proportion to the total heat 

 evolved, and the same maybe said of the volume correction on account 



F i 



\ 



\ 



\ 



of the cooling of the space external to the charcoal. With a variable 

 material like cocoanut charcoal I have in the calorimetric experiments 

 used the same sample in all cases. The following table embodies the 

 general results per cubic centimetre of charcoal. The gas absorption is 

 given at and 760 mm. li the volume of gas absorbed had been 

 measured under the same conditions of pressure at - 185 C., then 

 the numbers in Column II would all have to be divided by three. 



I. 



Volume 

 absorbed. 



0C. 

 Hydrogen ............ 4 c<c . 



Nitrogen ............... 15 



Oxygen ............... is " 



Helium ............... 



Electrolytic gas ...... 



Carbonic oxide and 



oxygen 

 Carbonic oxide 



12 

 2 



12 

 30 



21 



U. 



Volume 

 absorbed. 

 -185C. 



135 c.c. 



155 



230 



175 



15 



150 



195 



190 



III. 



Heat evolved. 

 Gramme calories. 



9-3 

 25-5 

 34-0 

 25-0 



2-0 

 17-0 

 34-5 



27-5 



