1888.] Arterial Pressure on the Mammalian Heart 291 



increase in the force of the beat, at least in the ventricles 

 (fig. 4). 



Fig4> Ao 



(2.) On the other hand the relation of the ventricular power to 

 the arterial resistance may be snch that the left ventricle is not able 

 to expel its contents at each beat in the normal fashion. The record- 

 ing lever fails to descend to the usual level between the contractions ; 

 it remains elevated to a considerable extent from the ordinary base 

 line. 



The results occurring in both the conditions referred to — (1) and 



