564 



Comparative Animal Physiology 



TABLE 69 (continued). EFFECTS OF SALTS IN HIGH (SUPRAOPTIMAL) AND 



LOW iSUBOPTIMAL) CONCENTRATIONS ON HEARTS IN RESPECT 



TO RATE OF BEAT, AMPLITUDE, TONE, AND STATE 



WHEN ARRESTED. 



4-, increase; — , decrease in a function. High concentrations given X normal. 



Animal 



Rate 



Ampl. 



Tonus 



Arrest 



Rate 



Ampl. 



Tonus 



Arrest 



HIGH CALCIUM 



LOW CALCIUM 



HIGH MAGNESIUM 



LOW MAGNESIUM 



