HYDE: EXPERIMENTS ON THE SKATE. 

 Curve 45. Effect of m/64 BaCla. 



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Upper, cardiac curve; rate unchanged, force and blood pressure slight 

 increase. Lower, respiratory curve; rate unchanged, force increased. 



Curve 46. Effect of m/32 BaCb. 



Upper, Hiirthle cardiac curves; after one minute, rate, force and pres- 

 sure unchanged. In five minutes, force and pressure increased. Lower, 

 respiratory curve, shows rate unchanged, force increased. 



Curve 47. Effect of m/8 BaCl2. 



B half an hour after A. Upper curves of A and B, cardiac and blood- 

 pressure records, show first spasmodic activity, then strong force and in- 

 creased pressure. These activities decrease in half an hour but the rate 

 continues unchanged. Lower, respiratory curve, shows first spasmodic 

 action, then this stops for twenty minutes. In half an hour it is weak 

 and slower. 



The effect of distilled water passes off quite rapidly. For the 

 first tv^o minutes the rate of cardiac and respiratory activity 

 is lessened and the force of the heart-beat and blood pressure 

 slightly increased. The blood is rapidly affected and clots 

 easily; soon the equilibrium of salts is again established and 

 the normal action resumed. 



