207 



UNORGANISED FLUIDS. 



ART. VII. SALIVA. BILE. SWEAT. URINE. 



THE fluids comprised under the heading of UNORGANISED 

 FLUIDS differ from those of the first division, viz. the ORGA- 

 NISED, in that they do not contain, as essential elements, 

 organised structures ; solid organic particles are indeed 

 usually to be encountered in them, but these are to be re- 

 garded either as accidental or at all events as non-essential 

 adjuncts, and which appertain usually to the structure of 

 those organs from which the fluids have themselves pro- 

 ceeded. 



The presence and nature of the solids contained in the 

 UNORGANISED FLUIDS serve to indicate to a considerable 

 extent the condition of the glands by which they have been 

 secreted, and thus frequently throw great light upon their 

 pathology. 



There is, however, one kind of solid constituent which is 

 found almost constantly in these fluids, viz. the crystals of 

 various salts: these being however unorganised, their con- 

 sideration does not properly belong to a work devoted to 

 descriptions and delineations of organised tissues. 



It is proposed, therefore, in order to render the application 

 of the microscope to human physiology and pathology as 

 complete as possible, to prepare a separate treatise on the 

 subject of the crystallisations formed in the various fluids, 

 &c. of tlie body, under the title of HUMAN CRYSTALLO- 

 GRAPHY. 



We will now pass in review the fluids comprehended in 

 the division of UNORGANISED FLUIDS. In reference to 

 some of them but little remains to be said, as will have been 



