484 



Drs. T. L. Brunton and T. Cash. 



I 



K 4 . 



Stimulation of Ventricle (maximal stimulation) . 



Kj. Heart at room temperature, frog long kept in cold room. 

 K 2 . Temperature raised 2 C C. 



K 3 . Taken 10' later tlian K 2 , during which time temperature was raised 1° C. 

 K 4 . Temperature raised again 1° C. 



K 5 . Temperature raised 1° C, making about 5° C. altogether above Kj* 



r Drum of more rapid rotation used in tracings given in Appendix B. The electro- 

 magnet marks seconds. 



give its systole in due place, whilst the ventricular contractions are 

 still occurring. Not only is this indifference to ventricular action 

 observed on the part of the auricle, "but the counterpart may be occa- 

 sionally seen in the ventricle, failing to follow the normal systole of 



