THE ACTION OF THE SYMPATHETIC 



127 



ii. An increase in force. Before stimulation the height of the 

 ventricular beat was 9 cm., but during stimulation it reached 12 cm. 

 These measurements must be made from the lowest to highest points 



of the ventricular contraction, for the increase in force is to a con- 

 siderable extent masked by the change in character of the trace 

 brought about by the altered sequence. An increase in force of auri- 

 cular beat is also produced, though to a less relative degree than 

 with the ventricular. 



iii. An alteration in the sequence. There is produced a delay in 



