RESPIKATION. 



[CH. I 



(2) Take a filtering flask of 400 or 500 c.c. capacity, 

 having a lateral opening as shown in fig. 1 to which a glass 



Fig. 1. Exp. 2. 



tube, A, (4 or 5 mm. bore) is attached by thick rubber 

 tubing and wire ties. The end of A dips into the 

 mercury in the beaker Hg. The flask contains enougl 



