188 



EXPERIMENTAL PHARMACOLOGY 



gen will cause a decrease in the distance between consecu- 

 tive descending lines. 



If the instructor desires it is an easy matter to place a 

 gas measuring device in the path of the oxygen inflow tube 



' II 



To recording 

 tambour 



Mercury bulb 



Hemostet 



Bladder cannula 



into beaker 

 or to recorder 



Urachus 

 Loose liqature 



Fig. 179. Technic for inserting a bladder cannula or for connecting a mercury bulb 

 to record bladder contractions. (For discussion see text.) 



and measure the amount of oxygen run in at each filling 

 of the pan (see Fig. 172). This is instructive and is a 

 valuable procedure in the beginning, but with a little prac- 

 tice the operator will be able to attain sufficient accuracy 



