The body of man has in itself blood, phlegm, yellow bile, and black   bile; these make up the nature of the body, and through these he feels  pain or  enjoys health.  Now, he enjoys the most perfect health when  these elements  are duly proportioned to one another in respect to  compounding, power and bulk,  and when they are perfectly mingled.  Pain  is felt when one of these  elements is in defect or excess, or is  isolated in the body without being  compounded with all the others
		 
		
		
		
		
		
		
		
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