OXYGEN. 5 



No. of grammes of water raised 



SubstCUlCe. 1 C. in temperature by the combustion 



of 1 gramme of the substance. 



Albumen (egg) ... ... 5735 



Muscle ... ... ... 5660 



Peptone ... ... ... 5300 



Asparagin ... ... 3514 



Urea ... ... ... 2542 



Fat of pig ... ... 9477 



,, ,,ox 9486 



,, ,, sheep ... ... 9494 



,, butter ... ... 9216 



Olive oil ... ... ... 9400 



Rape-seed oil ... ... 9500 



Arabinose... ... ... 3730 



Dextrose ... ... ... 3740 



Galactose... ... ... 3720 



Fructose ... ... ... 3755 



Cane sugar ... ... 3955 



Milk sugar (cry st.) ... ... 3736 



,, (anhyd.) ... 3952 



Maltose (cryst.) * ... ... 3722 



,, (anhyd.) ... ... 3949 



Cellulose ... ... ... 4185 



Starch ... ... ... 4182 



As has been stated, the heat of combustion of a substance is 

 constant whatever be the manner in which union with oxygen 

 occurs, provided only that the same final products be obtained. 

 The temperature attained, however, varies greatly with the 

 conditions under which combination takes place. For example 

 the temperatures reached when substances are burnt in pure 

 oxygen are much higher than when they burn in air, though 

 the same products are formed and, as is seen from the above 

 statements, the same quantities of heat are evolved in both 

 cases. It will be easily seen why such different temperatures 

 are yielded, the combustion in pure oxygen takes place more 

 rapidly, in a smaller space (generally with a smaller name) and 

 the process is carried on without a large amount of cool, 

 indifferent gas (nitrogen) which would abstract heat and keep 



