THEEAPEUTIC VALUE OF LOCALIZED FARADIZATION. 169 



liave been able to observe, there is not in the ganglia any relation of 

 continuity hetiveen tJie joosterior roots and the ganglionic globules. It 

 follous that each ganglion should perhaps he considered as a source of 

 new fibres. In man and the mammalia, I have shown the existence 

 of unipolar cells ; and I believe I may even affirm that these cells 

 are very numerous." * 



This opinion of Kolliker's is in opposition to that of anatomists 

 in general, who believe that most of the cells possess two poles, of 

 which one is continuous with the spinal cord, the other with a 

 peripheral nerve-fibre. It cannot, moreover, be sustained, in 

 the presence of my own icono-photographie researches. In the 

 longitudinal sections of the spinal ganglia that I have photo- 

 graphed, I have found cells apolar, unipolar, and bipolar, the 

 number of one or of the other predominating according to 

 the chances of the section. Fig. 43, which represents a longi- 



Kig. 43. — Longitudinal section of a spinal ganglion from tlie cervical region, pbotogia[)hcd and 

 licliographed to 21 diameters. 



* A. Kollikcr, Elements d'hidoloqie liumaine: ^'Structure des qaiuilions sninaiLi\" 

 p. 355. 1856. J _^ I 



