50 



KANSAS UNIVERSITY SCIENCE BULLETIN. 



respiratory force decreases with increased strength of the so- 

 lution, while the blood pressure rises in all concentrations em- 

 ployed, showing that increase in blood pressure is not neces- 

 sarily associated with rise of respiratory activity but rather 

 with force of heart-beat. 



Table VII Showing the effect of NaOH solutions upon respiratory, 

 cardiac and blood- pressure changes. 



Curve 30. Effect of m/64 NaOH injections. 



Upper, Hiirthle curves of cardiac and blood-pressure changes; decrease 

 in rate, increase in force and blood pressure for two minutes. Lower, 

 gill-arch lever curves of respiratory changes unaltered. 



Curve 31. Effect of m/32 NaOH solutions. 



Cnrve 31. 



Upper, Hiirthle curves of cardiac and blood-pressure changes show a 

 first effect of two minutes of greatly increased force and slight decrease 

 in rate of cardiac rhythm. The blood pressure increased for two minutes, 

 respiratory rhythm decreased very little if at all. 



Curve 32. Effect of m/8 NaOH solutions. 



Curve 32, 



Upper, Hiirthle curves of cardiac and blood-pressure changes show m- 

 creased blood pressure and rhythm. Lower, respiratory curves, increased 

 rate but decreased force. 



