THE CEREBRO-SPINAL FLUID 113 



Continuing, we would recall that the processes of 

 cerebro-spinal circulation and excretion are accomplished 

 through the complicated series of spaces, inter-spaces, 

 channels, and terminal outfalls found in, and surrounding, 

 the entire nervous system, comprising brain, spinal cord, 

 and nerves, systemic and sympathetic, by the agency of 

 capillary force, mechanical displacement, gravitation, not to 

 mention the occult operation of what might be called vital 

 hydraulics and hydro-dynamics. 



The vessels, as we may call them, through which all this 

 cerebro-spinal fluid passes, consist of the meninges with 



m. 



FlG. 40. A, TWO TACTILE CELLS IN THE DEEPER PART OF THE HUMAN 



EPIDERMIS. (Merkel.) R, ENDING OF NERVES IN TACTILE DISCS IN 

 THE PIG'S SNOUT. (Ranvier.) 



n, nerve-fibre ; in, terminal menisci or tactile disks ; e, ordinary epithelium-cell ; 

 a, altered epithelium-cell, to which the meniscus is applied. 



their inter-spaces, the peri-neural extensions of these 

 meninges with the neurilemmar inter-spaces surrounding 

 the nerve fibres, fibrils, and terminal arborisations. 



True, a good deal of what has been advanced here and 

 elsewhere in this diary requires more complete anatomical 

 decipherment and exact histological proof before its accep- 

 tance can be absolutely claimed, but also true, we, so far as 

 our own observation enabled us, and so far as we could 

 procure materials from other sources published, and other- 

 wise to assist us, we have confined ourselves in pronouncing 

 our disbeliefs in accepted doctrines and in formulating our 

 own views respecting many of them, to the use of strict 

 methods of induction. 



