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PART II. THE SOLIDS. 



THE division of the various constituents of the animal fabric 

 into the two orders of FLUIDS and SOLIDS, although a very 

 ancient one, is yet, to a certain extent, arbitrary and arti- 

 ficial. The truth of this observation is rendered apparent 

 on reference to the several fluids, the description of which 

 has just been brought to a conclusion, and all of which con- 

 tain suspended in them, either as essential or as accessory 

 elements, various solid and organised particles: the liquid 

 portion of some of these compound fluids exhibiting also a 

 distinctly organised constitution, as, for example, the liquor 

 sanguinis and the fluid parts of mucus and of pus. 



The distinction referred to is not however without its use, 

 and is sufficiently well founded to serve the purposes of clas- 

 sification. 



Of the SOLIDS themselves it is unnecessary to make any 

 formal subdivisions: they will simply be treated of in the 

 order of their natural relationship with each other. 



Thus the various solid structures entering into the constitu- 

 tion of the animal organism will be described consecutively as 

 follows, each forming the subject of a distinct article : Fat, 

 Epithelium, Epidermis, Pigment Cells, Nails, Hair, Cartilage, 

 Bone, and Teeth; the various Tissues, the Cellular, under 

 which head Ligaments and Tendons will be described, the 

 Elastic, the Muscular, and the Nervous, including the de- 

 scription of the Brain and Nerves ; the Glands, Vessels, 

 Membranes; and, lastly, the Pathology of the Solids, will 

 be treated of. 



