On Electrical Stimulation of the Frog's Heart. 495 



the ventricle when arrested by a ligature applied around the junction 

 of the venous sinus with the auricles to recommence pulsation 

 resembles that of heat. 



There are many other points on which we think that a fuller con- 

 sideration of our experiments will throw light, but to take them up at 

 present would involve too lengthy a discussion of doubtful points in 

 the physiology of the frog's heart, and so we must reserve them for a 

 future time. 



