ACTION OF ALCOHOL 139 



yon avoid this possibility in any way? Is the superior 

 laryngeal nerve concerned in any way with your observa- 

 tions! Stimulate this nerve independently and study the 

 results. 



Place adrenaline solution in one injecting burette and 

 twenty per cent alcohol (made from absolute alcohol) in 

 the other. Start the drum and when about one inch of 

 satisfactory normal tracing has been taken inject two cubic 

 centimeters of the alcohol solution. The blood-pressure 

 and respiration are slightly affected. This gives you a fair 

 basis to estimate the resistance of the animal to the alco- 

 hol and to judge what size the next dose should be. If the 



Fig. 130. Harvard membrane manometer. 



dog is small or very susceptible the dosage must be re- 

 duced. When the records have returned to normal inject 

 as large a dose as you think the animal can safely stand 

 and yet make a good recovery. This will likely range 

 between five and fifteen cubic centimeters but may be much 

 larger in many cases. Secure two or three good tracings 

 from alcohol and then again stimulate one vagus nerve for 

 a brief period. When the records return to normal stop 

 the drum. How do the records obtained now compare 

 with those made before the drug was given? If the ani- 

 mal seems very weak or about to die inject one-half cubic 

 centimeter of adrenaline. 



2. Empty the alcohol out of the burette (give it back to 



