HYDE: EXPERIMENTS ON THE SKATE. 59 



Curve 50. Effect of m/16 NaH2P04 solutions. 



Upper, gill-arch lever records of respiratory activity, show increase in 

 force, rate unchanged. Lower, cardiac lever, records first an increase in 

 rate and force; second, rapid, shallow; in ten minutes quite normal in 

 rate and force. 



Curve 51. m/8 NaH2Po4 solutions. 



Carve 61. 



Upper, gill-arch lever records of respiration show increase in rate, and 

 after two minutes also in force; inspiration prolonged. Lower, cardiac 

 apex records. First minute prolonged diastole and increased force, fol- 

 lowed by slower rate; in five minutes quite normal in rate and force. 



8-Univ. Sci. Bull., Vol. V, No. 4. 



