65 



pile, like that of the tongue, only less conspicuous, 

 and folded into large plates. 



42. The Intestines are a continuation of the all. 

 nientary tube from the pylorus, wound together in va- 

 rious wreaths, yet without confusion, and to keep 

 them in their situation, fastened together by the me- 

 sentery, a strong membrane, which fastens them also 

 to the back. The intestinal duct is really but one ; 

 but because the parts of it differ in figure and use, the 

 upper part of it, divided into the duodenum, jejunum 

 and ileum, is termed the small-guts ; the lower part, 

 divided into the ccecum, colon, and rectum, is called 

 the great guts. All these are full of turnings and 

 windings, especially the small, that the more subtle 

 part of the chyle, both through the length and nar- 

 rowness of the passage, anil the agitation of the in- 

 testines, may enter the lacteal veins, and pass from 

 thence into the receptacle of the chyle. 



When the intestines are separated from the mesen- 

 tery, they are usually six times as long as the mau. 

 They have all a kind of vermicular motion, called the 

 peristaltic motion from the stomach downwards ; and 

 are lubricated with much fat, especially the great ones, 

 whose surface being more uneven, and their contents 

 less fluid, they need somewhat more to make them 

 slide easily. 



Likewise from the exhaling arteries distils a thin, 

 watry liquor into the cavity of the intestines not at 

 all acid, but like the juice of the stomach ; the quan- 

 tity of which liquor may be computed from the 

 large extent of all the excretory orifices, and from the 

 section of the secretory artery, a larger than which 

 we see ; no where in the body. 



The Duodenum, (so called because it is usually ten 

 or tweJve inches long), receives the gall and pan- 

 creatic juice, which are here mixed with the chyle. 

 The jejunum is so termed, because it is generally more 

 epipty than the rest. This may be occasioned partly 

 by its capacity, which gives a free passage to its 



