1913.] 



Electrical Axis of the Human Heart. 



521 



Dr. D. — In this case the electrocardiograms were taken with a simultaneous record of the 

 respiratory movements, and the measurements are given for the same (inspiratory) position in each 

 case. Upon another occasion the R. and L. values were found to be 20 and 15, i.e. the inferior n 

 came out = 16°, but no attention was then paid to the phase of respiration. In the accompanying 

 records the values are as under : — 



tan a = = 0"2. .\ a = 11°. 



Sup. 

 Inf. 



tan a — 2 



7-5 + 5 

 22-5- 



20 



22-5 + 20 



= 0-12. 



a = 7° 



Right superior. 



Left superior. 



Transverse. 



Right lateral. 



Left lateral. 



