35* RETROGRADE ABSORBENTS. SECT. XXIX. j 



to drink up the chyle and the other fluids from the 

 alimentary canal ; and they are termed lacleals, to. 

 diftinguilh them from the other abforberu veffels, 

 which have been termed lympatjcs. 



Thofe whofe mouths are difperfed on the exter- 

 nal (kin, imbibe a great quantity of water from the 

 atmofphere, and a part pf the perfpirable matter, 

 which does not eyapqrate, and are termed cutane- 

 ous abforbents. 



Thofe, which arife from the internal furface of 

 the bronchia, and which imbibe moifture from the 

 atmofphere, and a part of the bronchial mucus, 

 are called pulmonary abforbents. 



Thofe, which opei} their innumerable mouths 

 into the cells of the whole cellular membrane ; and 

 whofe ufe is to take up the fluid, which is poured 

 into thofe cells, after it has done its office there ; 

 may be called cellular Abforbents. 



Thofe, which arife from the internal furfaces of 

 the membranes, which line the larger cavities of 

 ttye body, as the thorax, abdomen, fcrqtum, peri- 

 cardium., take up the mucus poured into tfyofe car 

 vines ; and are diftingui(he4 by the names of their 1 

 refpe&iye cavities. 



Whilft thqfe, which arife from the internal fur- 

 faces of the urinary bladder, gall-bladder, falivary 

 due~ts, pr pther receptacles of fecreted fluids, may 

 take their names from thofe fluids ; the thinner parts 

 pf which it is their office to abibrb : as urinary, 

 bilious, or falivary abforbents. 



2. Many of thefe abforbent veflels, both lac~teal 

 and lymphatics, like fame of the veins, are replete 

 with valves: which feenr defigned to affift the pro r 

 grefs of their fluids, or at leafl to prevent their re- 

 gurgitation ; where they are fubjecled to the inter- 

 mitted preflure of the mufcular, or arterial adtion 

 in their neighbourhood. 



Thef? 



