EXTRACT V. 



ON CEREBRO-SPINAL LYMPH CIRCULATION AND 

 EXCRETION. 



A SYSTEM of circulation having been traced throughout 

 the whole extent of the nervous system, both central and 

 peripheral, and the means indicated whereby the cerebro- 

 spinal fluid, or lymph, is distributed to the most remote 

 terminations of the individual fibrils, its secretory appa- 

 ratus, or " fountain of supply/' also having been pointed 

 out, whereby it is kept constantly renewed, the reasonable- 

 ness of, and the necessity for, these arrangements become 

 more and more apparent and convincing ; the study of 

 its physiological uses, its pathological bearings and clinical 

 applications, in our opinion, therefore, call for a share in 

 the work of research now so active throughout the t world 

 of medicine and surgery." 



The various systems of circulation shortly alluded to, 

 or described, in certain earlier studies are all finally sub- 

 servient to this the nervine system of circulation. The 

 circulation of the food, solid as well as liquid, of the chyle, 

 of the blood, and of the lymph, besides the respiratory 

 aeration, and many other minor circulatory acts performed 

 throughout the various viscera and organs included in the 

 human body, lead up to the final neuro-systemic circulatory 

 acts of the supply of pabulum to the nervine structures, 

 and the laying down of a medium of mechanical support 

 and protection to these structures. For from the blood, 

 we contend, are deposited in the matrix of the neuroglia, 

 and not transferred directly to the neuronal structures, 

 the materials on which the growth and nutrition of the 



