ON CIRCULATION GENERALLY 37 



be sought for as a means of preserving health along these 

 lines. 



Circulation, as here outlined, in its neural lymph aspect 

 will be seen to be ultimately all-pervading so far as the 

 systemic nervous system is concerned, and its sustain- 

 ment, consequently, is all-important as a factor in systemic 

 hygiene, while its re-establishment, when in abeyance, 

 becomes a sine quo non in the treatment of disease. 



Besides what we have said of these great anatomical and 

 physiological forms of circulation, we may regard it- 

 circulation in a still wider and more comprehensive sense,, 

 as it can be seen and studied in detail in all parts of the 

 human body and the higher orders of the animal world, 

 in order to possess a firmer grasp and a fuller appreciation 

 of the great problems wrapt up in the simple hydrostatics, 

 and hydrodynamics of organised textures. 



Thus, we recognise that the three principal circulations,, 

 or systems of circulation, in the human subject are con- 

 nected with each other by means of what may conveniently 

 be called subsidiary or connecting circulations, or sets of 

 connecting inter-spaces or cells. The first, the gastro- 

 intestinal, is connected with the second, the blood circu- 

 lation, by means of the lacteals and the thoracic duct, while 

 the second is connected with the third, or cerebro-spinal, 

 through the vasculature of the pia mater^ the third, or 

 cerebro-spinal, again uniting itself respectively with the 

 blood circulation through the motor, or efferent, nervature 

 and the gastro-intestinal circulation through the sympa- 

 thetic " nervi communicantes" 



The cerebro-spinal lymph circulation, besides again 

 allying itself with the other two great circulations, elimi- 

 nates from the body a large quantity of effete materials 

 resulting from neural waste, by certain excretory mechan- 

 isms, these effete materials being gathered from the whole 

 extra-, inter-, and intra-cerebro-spinal spaces, consisting ot 

 the sub-dural and sub-arachnoid spaces, the ventricles of 

 the brain, and central canal of the cord, with the related 

 peri-vascular and peri-saccular spaces of the neuroglial 

 matrix, and the whole inter-neurilemmar spaces of the 

 systemic and related sympathetic nervatures. Such a large 

 vascular area^ if we may use the phrase, circulating a fluid 



