194 



ENDOCAKDIAC PKESSUKE. 



[Book i. 



Fig. 39. Curves of Endocardiac Pressure. From Left Ventricle of Dog. 



(Roy and Rolleston.) 



A. a quickly beating, B. a more slowly beating heart. 



An instrument which has been much used of late, and the use 

 of which has given very valuable results is the " membrane-mano- 

 meter " of Hiirthle. 



Fig. 40- The Membrane-manometer of Hurthle. 1 



1 For this figure I am indebted to Mr. Albreeht, the University Instrument- 

 maker at Tubingen. , 



