58 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Curve 48. Effect of distilled water. 



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Upper, Hiirthle cardiac and blood-pressure cunves, show decrease in 

 rate, slight rise in force and blood pressure for two minutes, then normal. 

 Lower, respiratory lever, gill-arch curve, shows decrease in rate, force 

 unchanged for two minutes. 



Acid sodium phosphate solutions cause an increase in force 

 of respiratory and cardiac activity, and for the weaker solu- 

 tions at first also an increase in rate. Diastolic and inspiratory 

 phases are often prolonged and the toxic effect is overcome by 

 an alkali solution of sodium phosphate or one of CaCk. 



Table XIV. Showing mean results of NaH2P04 solutions. 



Curve 49. Effect of m/64 NaH2P04 solutions. 



Carre 49. ^ rt /, / 



Upper records of respiratory activity before, during ancj following for 

 two minutes the injection of an m/64 acid phosphate solution. First 

 minute rate greatly increased, force less; within two minutes force gradu- 

 ally increased to slightly above normal and rate normal. The lower car- 

 diac record shows first rapid contractions that increase during the second 

 minute in force, becoming normal in rate and force in two minutes. 



