ipo ESSAYS AND OBSERVATIONS 



the furrounding parts *, by which we had 

 a view of the membrano-cellular coat f 

 (fee fig. S' & ^' F^O lyi^g immediately 

 below ; and then raifed this membrano- 

 cellular coat from that called mufcular J, 

 (fee fig. 6. GG.) which was every where 

 lined with the fine villous coat ||. 



I would have diffeded all the other a- 

 jieurifmal facs j but, my brother being de- 



firous 



* This loofe cellular fubftance, when feparated from 

 the other parts, coUapfes into the form of a membrane, 

 and has very improperly been reckoned by many authors 

 one of the coats of the arteries. 



f This coat was demonftrated near thirty years ago, 

 by my Father, to be compofed of a denfe cellular fub- 

 ftance. See Med. Eflay. vol. 2. 1733. It has been cal- 

 led tendinous by Ileifter, and ligar/tento-e/aftica by Ni- 

 chols, and cellulofa propria by Haller. 



:J: This coat, compofed of reddifh, circular, and flefl». 

 like fibres, has been called mulcuhr by moll anatomifts ; 

 they who call it white tendinous, feem either to have 

 iniftaken the former for it, or to have raifed the two to- 

 gether, 



U This moft internal coat is denfe and fmooth, it has 

 been called by fome nervous, by others villous. 



Befides thefe, there are two fine cellular coats, i. One 

 ■which connefts the membrano-cellular with the mufcular. 

 5. Another which joins the mufcular with tbo nervous 

 or villous. 



