44 BIOLOGICAL PHYSICS 



sities of the various textures of the body. Included in 

 the number of these circulations are the hepatic proper,, 

 apart from the portal, the pancreatic, the splenic, the renal,, 

 the testicular, and uterine, which modify the blood stream 

 by the excretion from it of certain vitally active and 

 certain residual materials, some of which are made avail- 

 able for certain digestive purposes and perpetuative 

 functions, while the greater part is absolutely eliminated 

 from the system. The splenic, the adrenal, the thymus, 

 the thyroid, with other such but less prominent ductless 

 glands, being merely modifying organisms developed 

 within the blood circulatory apparatus, pass through the 

 blood itself, modifying while not apparently extracting 

 anything from it. 



All these circulations are only concerned in the func- 

 tions of organic life and the economy of nutrition, and 

 are entirely dependent on the existence and circulation of 

 sympathetic nervine energy through cell and fibre agency. 

 Above and beyond these circulations the higher functions 

 of systemic nervine circulation are provided for in the 

 elaborate machinery of the central and peripheral systemic 

 nervous system ; here the first circulation with which we 

 are met is the cerebro-spinal lymph circulation, a circula- 

 tion conterminous with the structural area of that system,, 

 plus the prolongation into the sympathetic area of the 

 motor lymph residuum ; while the second or innermost 

 discoverable is the great compound nervine circulation 

 proper, which, commencing with the neuro-cellulo-fibral or 

 neuronal developments, centrally extends to the musculo- 

 cutaneous textures of the whole body where the circulated 

 materials terminate in textural incorporation, and final 

 shedding respectively, as muscle pabulum, on their motor 

 aspect, and as epidermal exuviae, or debris, on their sensory 

 aspect. 



In this brief survey of circulation, as it is observed in 

 the human organism, we observe that two distinct systems 

 of circulation are evolved, or become apparent, namely, 

 the haemal and the neural, and that each of these circula- 

 tions displays a central portion in which the phenomena of 

 nutrition, or of structural integration and disintegration, 

 take place, the preceding and succeeding circulations, or 



