THE SYSTEMIC NERVOUS SYSTEM 39 



conjointly, take part locally in the manipulation of both 

 nutritive pabulum and effete or excrementitious materials ; 

 here, in short, are provided both the material and dynamic 

 conditions and formative materials for the production, 

 figuratively speaking, of a "kirk or a mill," and it will, 

 therefore, depend on the nature of the blending of the 

 materials, and the play of the mixed formative energies, 

 what formative results may be attained under the modi- 

 fying influences of the systemic hygiene and the operation 

 of the vis medicatrix nature. 



