EXTRACT XXXIII. c. 



ON WHAT THE DISTINCTNESS, AND RELATIONSHIPS, 

 OF THE NERVOUS SYSTEMS LEAD TO. 



WE have already said that the systemic nervous system, 

 in whole, and in part, is anatomically, and histologically, 

 distinct, from its surrounding non-nervous related textures, 

 with the exception of where its dendritic, and terminal, 

 extensions, commingle with, its inlet, and outlet, sympa- 

 thetically innervated economy, in contradistinction to the 

 intermediate complete insulation of the entire axonal 

 fibres, of the systemic nervature. Into this inner, and 

 non-related, or distinct, anatomical nerve area, we contend, 

 therefore, that no substance can enter, save by the den- 

 dritic, or proximal processes, and that no substance can 

 be excreted, save by the peripheral, or distal nerve 

 terminals, sensory, and motor ; from which it must 

 follow, that all substance, entering and passing through, 

 this intermediate nervine area, must circulate, from its 

 proximal, to its distal extremity, and leave it there, and, 

 therefore, must consist of neuronal pabulum, or nerve 

 plasma only, and be obtained from the matrix of the 

 neuroglia, by the nerve cell dendrons, and circulated to 

 the peripheral extremities of the axons, by one continuous, 

 and uninterrupted, system of circulation, a system of 

 circulation, which is par excellence^ the innermost, and 

 terminal, circulation, and which, in histologically ending, 

 ministers to the growth of the non-nervous structures, 

 with which it is distally related, on the completion of its 

 intra-nervine course, by exudation through the entirety of 

 the nerve terminals, into the matrix of the tissues, in 



