174 



A TEXTBOOK OF PHYSIOLOGY 



(i) 



Oil 



M 1 M I M I I I I I M I M I M I I I I M N I I I I f M I M I 



//A 



(in) 



R.A8oo > 



*4ff|| 



'f 1 'HI Iff ll 'ii 1 



FIG. 78. ^TRACINGS (i.) TO SHOW AND (ii.) THE ABOLITION OF EFFECT. OF^ RIGHT 

 ACCELERATOR IN THE DOG, FREEZING THE S.-A. NODE. THE ACCELERATOR 

 NERVE WAS STIMULATED BETWEEN THE STROKES, (iii.) THE ACTION OF RIGHT 

 NERVE BEFOREHAND THE ACTION ALSO RETURNED AFTER THEJ; EFFECTS [OF 

 THE COLD HAD PASSED OFF. (M. F.) 



FIG. 79. To SHOW THE ACTION OF THE LEFT ACCELERATOR IN THEjDoo EVEN AFTER 



FREEZING OF S.-A. NODE. (M. F.) 



The nerve stimulated from A'-A" ; freezing started at K' and continued all the time. 



