48 KANSAS UNIVERSITY SCIENCE Bl I 1 FTIN. 



Curve 26. Na2C03 m/2. 



Upper, respiratory gill-arch lever records. Increased force, decreased 

 rate. Lower, cardiac lever directly attached to heart. Increased force, 

 decreased rate. Time, five seconds. 



Na2HP04 solutions are not so stimulating to cardiac rhythm 

 as are Na2C03 solutions. This is shown in table VI. More- 

 over, for the same strength they are more toxic. The solutions 

 act like Na2C0r> chiefly upon the force of the cardiac action and 

 are indifferent in weak solutions on respiratory movements. 



Table VI. A summary of experiments of intravenous injections of 

 Na2HP04 relating to cardiac and respiratory activity and blood pressure. 



Curve 27. Effect of Na2HP04 m/64. 



Upper, cardiac and blood-pressure Hiirthle manometer curves; show 

 force of heart action and blood pressure; slight increase, rate decrease. 

 Lower, respiratory rhythm unaltered, Time, 5 seconds. 



