2r8 OF THE STOMACH Sect. XXV. p 



of digeftion, are ftimulated to difcharge their contained fluids, 

 and to feparate a further fupply from the blood-veflels : and the 

 lacteals or lymphatics, which open their mouths into the ftomach, 

 are ftimulated into action, and take up fome part of the digefting 

 ©■.aterials. 



3. The remainder of thefe digefting materials is carried for- 

 wards into the upper inteflines, and ftimulates them - into their 

 periftahic motion fimilar to that of the ftomach ; which contin- 

 ues gradually to mix the changing materials, and pafs them along 

 through the valve of the colon to the excretory end of this great 

 gland, the fphincter ani. 



The digelting materials produce a flow of bile, and of pancre- 

 atic juice, as they pafs along the duodenum, by ftimulating the 

 excretory duels of the liver and pancreas, which terminate in 

 that inteftine : and other branches of the abforbent or lymphatic 

 fyftem, called lacteals, are excited to drink up, as it pafles, thofe 

 parts of the digefting materials, that are proper for their purpofc, 

 by its ftimulus on their mouths. 



4. When the ftomach and inteflines are thus filled with their 

 proper food, not only the motions of the gaftric glands, the pan- 

 creas, liver, and lacteal vefTels, are excited into action \ but at 

 the fame time the whole tribe of irritative motions are exerted 

 with greater energy, a greater degree of warmth, colour, plump- 

 nefs. and moifture, is given to the fkin from the increafed action 

 cf thofe glands called capillary vefTels ; pleafurable fenfation is 

 excited, the voluntary motions are lefs eafily exerted, and at 

 length fufpended ; and fleep fucceeds, unlefs it be prevented by 

 the ftimulus cf furrounding objects, or by voluntary exertion, or 

 by an acquired habit, which was originally produced by one or 

 other of thefe circumftances, as is explained in Sect. XXI. on 

 Drunkermefs. 



At this time al fo, as the blood-veflels become replete with 

 chyle, more urine is feparated into the bladder, and lefs of it is 

 reabforbed ; more mucus poured into the cellular membranes, 

 and lefs of it reabforbed : the pulfe becomes fuller, and fofter, 

 and in general quicker. The reafon why lefs urine and cellular 

 mucus is abforbed after a full meal with fufficient drink is owing 

 to the bleod-veflels being fuller : hence one means to promote ab- 

 sorption is to decreafe the refiftance by emptying the vefTels by 

 1 : eftion. From this decreafe^ abforption the urine becomes 

 pale as well as copious, and the lkin ajmears plump as well as 

 florid. 



By daily repetition of thefe moknent" they all become con- 

 nected together, and make a diurnal cirds of irritative action, 



anl 



