Chap. 15.] [ 199 ] 



CHAP. XV. 



THE CELLULAR SUBSTANCE, FAT, AND INTEGU- 

 MENTS OF THE BODY. 



General Dcfcripticn of the Cellular Sub/lance ; its. Ufes. The Fat ; 

 it i Ufes. 'fit, S&ia. The Organ of Touch. The Epidermis. 

 Caufe of the llac k \ Colour of the Africans. Corns. Font ana's 

 microfcopic Qbfer*u aliens on the Spider mis. ~ -Quantity of Pcrfpiration 

 from the Human Body. 



IN the preceding chapters the mufcles of the human 

 body have been treated of as fo many diftinct and 

 feparate mafles of flefli. Jt is neceflary, however, to 

 remark, that when the anatomift comes to trace them 

 in the fubjecl:, he finds the cafe far otherwife, as moll 

 neighbouring mufcles are mixed and confufed together 

 by an intertexture of fibres, as well as by being in- 

 volved in cellular fubftance. 



The cellular fubftance is a loofe fibrous web, and 

 when filled with air plainly exhibits its real ftructure, 

 viz. that of cells communicating with each other. 



This fubftance forms a great part of the body, as it 

 is interpofed between all the mufcles, all the fafciculi of 

 mufcular fibres, and it fhoukl feem alfo, that it in- 

 volves the ultimate fibres, of which theie fafcicuii 

 are compofed. 



All the blood- veflels alfo, and nerves, are in their 

 courfe attached to the neighbouring parts by means 

 of this fubftance. Many of the glands too, which are 

 compofed of fmaller rnafTes, are united into one body 

 by its intervention. It feems probable, indeed, that 

 the membranes which inveft the contents of the ab- 

 domen and thorax, and other membranes in other 

 O 4 parts 



