56 



THE OUTGO OF ENERGY 



immediately under the levator anguli scapulae 

 muscle, which must be carefully removed. The 

 nerve will then be visible. It is commonly pig- 

 men ted and usually lies under an artery. Care- 

 1 ully isolate the nerve. Put a ligature around it 



r?v ~~^\ \ 



i ^-> \ 



Fig. 72. Scheme of the sympathetic nerve in the frog. OC. Occiput. 

 LAS. Levator anguli scapulae. Sym. Sympathetic. GP. Glosso-pharyn- 

 geus. V-S. Vago-sympathetic. G. Ganglion of the vagus. Ao. Aorta. 

 8A. Subclavian artery. (After Stirling's reproduction of Gaskell and 

 Gadow's plate.) 



as far away from the skull as practicable, and 

 cut the nerve caudal to the ligature. 



Action of the Sympathetic on the Heart. 

 Arrange the inductorium for weak tetanizing cur- 

 rents. In the primary circuit place the electro- 



