8 



RESPIRATION. 



[CH. I 



distilled water, care being taken that no air bubbles 

 remain in the connecting india-rubber tube. F is then 

 raised till water flows out of H ; then the stop-cock L is 

 closed and H is connected by tubing with the vessel J in 

 fig. 3 containing the gas to be analysed. F, now nearly 

 empty, is lowered and L opened, so that a sample of gas 

 is drawn into the burette. L is closed and H disconnect- 

 ed. The volume drawn in is then measured by means of 



U 



=C:^^---a 



Fig. 5. Exp. 4. 



