142 



ACTTOX OF DIGITALIS ON THE BLOOD-VESSELS. 



employed because Blake* found that digitalin produced a much 

 greater effect on the blood-pressure when introduced into the 

 circulation in this way than if injected into a vein. A com- 

 parison of the tracings thus obtained, after the injection, with 

 that of the normal pressure and pulse (fig. 98), showed a slow- 



Fig. 98. 



ing of the pulse, accompanied by an increase in the mean blood- 

 pressure, while the height of the wave occasioned by each 

 cardiac pulsation remained much the same (fig 99). The pres- 



FiG. 90. 



sure contmued to rise gradually although the pulse not only 

 became slower and slower, but the oscillations of the mercurial 



* Blake, Hd. Med. Journ. 1839. 



