21!) 



1. The ^'iis becomes heated during the cuuihu.stion. so care must be 

 taken to determine tlie final temperature at which the gas is measured. 

 Corrections nuist be made for all temiierature changes. 



2. A correction must be made for the carbon dioxide which remains 

 in the quartz tube after the combustion. Tliis disadvantage can be over- 

 come perhaps by the use of a smaller bore capillary quartz tube in which 

 the volume is so small that a correction is unnecessary. 



Indiium rnircr.s-ity. lilooininutoiK 



