202 



EXPERIMENTAL PHARMACOLOGY 



by hemostats on each side. The tambour should have a 

 large boAvl (three inches, see Fig. 14). Bring the writing- 

 point of the tambour on to the drum above the blood-pres- 

 sure and adjust the tambour to give a tracing about two 

 or three inches high. The force of the respiration may 

 have to be changed to give this. The rate of inflations 



Fig. 193. Blood-pressure and bronchiole tracings showing the action of dionine. 

 Adrenaline caused a prompt dilatation. The method used is described in Experiment 

 LXX, p. 287. 



should be about twenty or twenty-five times per minute. 

 Start off the drum (slow speed) and take one or two inches 

 of normal record. Then inject five cubic centimeters of 

 the opium alkaloid solution. The blood-pressure falls at 

 once but the heart should not stop. What does the lung 



