NER VE- GANGLIA . 103 



that pierce the capsule. The cells very frequently contain a yellowish-coloured pigment. 

 Between the cells will be found transverse sections of non-medullated nerve-fibres. 



SYMPATHETIC NERVE-CELLS OF THE FROG. 



These have already been alluded to in connection with the heart. They occur in large 

 numbers along the course of the abdominal aorta in the frog, and are easily demonstrated by 

 the lime-juice and gold method (p. xlv). They may also be obtained from the sympathetic 

 ganglia. It is easy to demonstrate the straight process, but by no means so easy to see the 

 spiral one. 



Isolation of Sympathetic Nerve-cells. Adopt the same methods as are recommended for 

 the nerve-cells of the spinal cord. 



