PLATE LXXXV. 



FIR. 2o5.-Fick's spring kymograph. A. C-spriiig. BE. Supiwrt. <'. Itod which rommmiicateK the movements 

 of the spring to the lever 1>, and thus to the writiug-ueedle G. K. Leaden tulje by which the cavity of the 

 spring is in communication with the artery. 



Fig:. 207 



K I It li 



Fie: 207a 



FIG. 207.- Norm vl arterial tracing obtained with the spring '-.ymograph (dog under curare). 



FIG. zoya. Tracing of same animal after exhaustion of vagus by repeated excitations ; dicrotous pulse. 



K 



FIG. 208. Mechanical arrangement of the siihygmograph ( 38). 



