226 KANSAS UNIVERSITY SCIENCE BULLETIN. 



CONCLUSION. 



The frog's blood-pressure is not a reliable means of stand- 

 irdizing adrenalin, because the frog shows a decrease in sus- 

 ceptibility to the drug after the first or second injection. 



With the exceptions of KCl, which required a stronger solu- 

 tion to produce depression, and BaCL which required a weaker 

 solution to increase pressure and heart action, the salts ex- 

 perimented with had practically the same effect upon the frog 

 as they had upon the cat. 



