RESPIRATION. 



[CH. 



flask, another washing bottle B containing baryta water 

 is fitted between F and the experimental flask, A. 

 The drop-aspirator figured by Detmer' answers very well. 



Fio. 2. Exp. 3. 



it is made from a distillation tube and is attached to 

 a tap through which a current of water in detached 

 drops passes, and produces a correspondingly slow suction- 

 current of air at the side tube (c in Detmer's figure)* 

 The outflow tube should be about 2 feet in length 

 to insure that the suction is strong enough. In the 

 absence of a drop-aspirator the current may be moderated' 

 as Sachs recommends by allowing the air to enter the 

 first washing bottle through a fine capillary tube. If 

 the sink in the laboratory is inconveniently placed . the 



1 Praktikwm, p. 179, fig. 76. 



