ELEMENTARY EXPERIMENTAL PHYSIOLOGY 125 



Fio. 124. Sphygmograph provided with time writer (Jacquet.) 



Flu. 1-25. Pulse tracing (sphygmogram) taken by Jacquet s sphygmograph. 



ad = the period of the pulse curve, 6 = the primary, c=the dicrotic wave. 



Time marked in fifths'of a second. 



