468 BIOLOGICAL PHYSICS 



machinery within, and of the indications presented as to 

 measures of rectification. A profound contrast must here 

 be recognised as separating the two different sets of funda- 

 mental conditions, viz. the haemal and the neural, and 

 determining the character of contingencies, diagnostic and 

 therapeutic. In dealing with many of the more ordinary 

 dermatological problems, the clinical use of the above 

 observations may also claim some value. 



The degree of intensity to which the phenomena of 

 blushing, flushing and blanching may at any time reach is, 

 no doubt, regulated by vaso-motor innervation, so far as it 

 is the outcome of haemal circulation, but the profundity of 

 the degree to which blanching may reach may be regarded 

 as the outcome of accentuation of neuronic circulation 

 within the neural vasculature and stasis, or it may be 

 increased flow of the neural fluids within the nerve 

 terminals of the parts involved. Circulation thus, once 

 more, becomes the key to unlock the problems involved 

 in the natural phenomena of blushing, flushing, and blanch- 

 ing of the skin of the cheek and of the general cutaneous 

 surface, and illustrates again the truth which we have so 

 often repeated : circulatio circulationum, omnia circulatio. 



The phenomenon of diaphoresis is intimately associated, 

 on many occasions, with the phenomena of blushing, flush- 

 ing, and blanching, so much so indeed that a clue is 

 afforded to the explanation of the sequence of the physio- 

 logical events which make them up ; thus, the flushing of 

 violent exercise throws on the sudorific exits more material 

 than can be passed through them in their usual or normal 

 condition, hence we have sudoral accumulation and 

 hindered haemal circulation, culminating in more or less 

 pronounced stasis and rubicundity of surface, while 

 blanching, as a contrast, may be attended with the most 

 profuse diaphoresis. 



