KANSAS UNIVERSITY SCIENCE BULLETIN. 



LTRVE 39. Effect of m/8 HCl on cardiac, respiratory and blood pres- 

 changes. • 



Curve 39 

 sure 



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Upper, gill-arch lever respiratory curve shows increase at first of rate 

 and force, then gradual decrease. Lower, apex lever curve shows at once 

 fall in force and rapid heart-beat that soon becomes irregular and spas- 

 modic before ceasing. 



Injection of different strengths of NH4CI solutions show that 

 weak solutions are quite indifferent. An m/8 solution increases 

 blood pressure and force of respiratory movements, but an 

 m% depresses cardiac and blood pressure activities and greatly 

 stimulates the expiratory phase of respiration, causing an ir- 

 regular spasmodic rhythm for fifteen minutes, and this is re- 

 placed by a weak but regular activity. 



Table X. Effect of|NH4Cl!solution8. 



Curve 40. Influence of NH4CI m/8 on cardiac respiratory and blood- 

 pressure changes. 



Upper, Hiirthle cardiac and blood-pressure curves show that rate and 

 force are unchanged, blood pressure rose. Lower, respiratory curve; 

 rate unchanged, force slight increase, 



