56 



KANSAS UNIVERSITY SCIENCE BULLETIN. 



Uppei', Hiirthle cardiac and blood-pressure curves; rate unchanged, 

 force and pressure slight increase. Lower, respiratory curve; rate un- 

 changed, force increased. 



Curve 44. Effect of m/1 Na2S04. 



Curve 44. 



Upper, cardiac and blood-pressure curves, show slight increase in force 

 and pressure, rate unchanged. Lower, respiratory; rate unchanged, force 

 increased. 



The effects of intravenous injections of BaCk solutions are 

 increased irritability and increased force and blood pressure, 

 especially with weak solutions. Like most of the other salt 

 solutions, it does not increase the rate of either heart or re- 

 spiratory activity. In strong solutions it is toxic, producing at 

 first irregular spasmodic cardiac and respiratory phases with 

 strong diastolic and expiratory phases and with rise of blood 

 pressure, or cessation of activity. The toxic effects can be 

 avoided if small doses are injected with gradually increasing 

 strengths, and the toxic effect is overcome by injections of 

 CaCk solutions. 



Table XIL 



Effect of BaCli on cardiac, respiratory and blood- 

 pressure changes. 



