OF THE FLUIDS. 



SECT. II. 



OF THE FLUIDS IN GENERAL, AND PARTICULARLY 



OF THE BLOOD. 



4. THE fluids of the body may be conveniently re- 

 duced to three classes. 



A. The crude; viz. the chyle, contained in the primae 

 viee and destined to become blood; and matters ab- 

 sorbed on the surface and destined to be conveyed to 

 the chyle. 



B. The blood itself. 



C. Those secreted from the blood, whether inert and 

 excrementitious, like the urine ; or intended for certain 

 purposes in the economy: the latter may be perma- 

 nently liquid, as the bile; or disposed to solidity, as 

 the osseous and other plastic juices. 



5. Of the first and third of these classes we shall 

 hereafter speak, in treating of chylification, secretion, 

 and the other functions to which each fluid appertains. 

 At present our attention shall be devoted to the blood* 

 the chief and primary fluid the vehicle of those suc- 

 cessions of oxygenous and carbonaceous particles, 

 which cease with life only the nourisher of the frame 

 the source of almost every fluid that into which the 

 crude fluid is converted and from which all the secre- 

 tions are derived and which, with the exception of 

 some exsangueous parts, as the epidermis, the arach- 

 noid, the amnion, &c. the vitreous substance of the 



* J. Hunter, Treatise on the Blood? Inflammation, &r, Lontlon. 1794. Ito. 



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