? 3 8 RETROGRADE Sect. XXIX. i. u 



SECT. XXIX. 



ON THE RETROGRADE MOTIONS OF THE ABSORBENT SYSTEM* 



I. Account of the abforbent fyjlem. II. The valves of the abforbent 

 veffels ;r;. v fuffer their funis to regurgitate in fome difeafes. III. 

 C: * io7i from the alimentary canal to the bladder by means 



of the abforbent vejftis. IV. The phenomena of diabetes explained. 

 V. I. The pi. wa cf drcpfies explained. 2. Cafes of the tife * 



c f foxglove. VI. Of cold five at s. VII. Tranfations of matter , 

 of chyle , of milk , cf urine > operation of purging drugs applied ex- 

 ttma'/y. VIII. Circumjlances by ivhich the fluids, that are ef- 

 fufed by the retrograde motions of the abforbent veffels, are diflin- 

 tjhed. IX. Retrograde motions of vegetable juices. X. Ob- 

 jections anjkuered. XI. The caufes, ivhich induce the retrograde 

 motions of animal vejfels, and the medicines by ivhich the natural 

 motions are reflored. 



N. B. The following Section is a tr (inflation oj apart of a Latin the- 

 fis ivritten by the late Mr. Charles Darwin, ivhich ivas printed 

 ivith his pyrze-differtation on a criterion between matter and mu- 

 cus in 1 7 oo. Sold by Cadell, London. 



I. Ac con tit cfthe Ahforbent Syflem. 



f 

 i. The abforbent fyPcem of vefTels in animal bodies confifts 



of feveral branches, differing in refpect. to their fituations, and 



to the fluids, which they abforb. 



The inte'tinal abforbents open their mouths on the internal 

 furfaces of the intefiines j their office is to drink up the chyle 

 and che other fluids from the alimentary canal ; and they are 

 termed lacteals, to diflinguiih them from the other abforbent vef- 

 fels, which hive been termed lymphatics. 



Thofe, whofe mouths are difperfed on the external fkin, im- 

 bibe a great quantity of water from the atmofphere, and a part 

 of the perfpirable matter, which does not evaporate, and are 

 termed cutaneous abforbents. 



Thofe, which arife from the internal furface of the bronchia, 

 an i which imbibe moiflure from the atmofphere, and a part of 

 the bronchial mucus, are called pulmonary abforbents. 



Thofe, which open their innumerable mouths into the cells of 

 tie cellular membrane ; and whofe ufe is to take up the 

 fluidi which is poured into thofe cells, after it has done its of- 

 . ; may be called cellular abforbents. 



Thofe, which arife from the internal furfaces of the mem- 

 branes, 



