160 



EXPERIMENTAL PHARMACOLOGY 



2. With a medium tetanizing current stimulate the right 

 vagus nerve for a second or so. How does this affect the 

 respiration, blood-pressure, and cerebrospinal pressure? 

 What mechanical factors are involved ? Xow inject one- 

 half cubic centimeter of adrenaline and repeat your obser- 

 vations. What mechanical factors are concerned? 



When the records return to normal inject two cubic cen- 



Fig. 152. Spleen oncometer for dogs. A little less than natural size. 



timeters of alcohol. Note the effect on the circulation and 

 respiration and then estimate how much larger dose you 

 can safely inject. When the records return to the nor- 

 mal inject more alcohol and watch carefully for changes in 

 the cerebrospinal fluid. It may be necessary to inject three 

 or four times to produce any results. "What do you ob- 

 serve! How do you explain this? Stop the drum and 

 wait ten minutes to allow the animal to recover and to see 



