HYDE: EXPERIMENTS ON THE SKATE. 



41 



heart action. In some experiments the toxic effect of KCl 

 m% was overcome if CaCL was injected soon after the KCl 

 solution. 



Curve 10. Toxic action of KCl m% counteracted by NaCl m%. 

 attached to ventricle and gill arch. 



Levers 



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Time, five seconds. Upper, respiration. Lower, cardiac curves.* 



5. Within a few seconds after injecting m% at X, the heart action became irregular 

 and spasmodic in long diastole. In twenty-five seconds the greatly increased respiratory 

 movements assumed prolonged expiratory spasms and a few seconds following m% NaCl 

 injection both respiratory and cardiac action became more regular again. m% NaCl 

 proved antitoxic for the toxic dose of m% KCl. 



