348 RETROGRADE SECT. XXIX. 4. 7, 



oufly abforbed, into the inteftines and bladder. At the very 

 inftant that the body is expofed naked to the cold air, an unu- 

 fual movement is felt in the bowels ; as is experienced by boys 

 going into the cold bath : this could not occur from an obftruc- 

 tion of the perfpirable matter, fince there is not time for that 

 to be returned to the bowels by the courfe of the circulation. 



There is alfo a chronic aqueous diarrhoea, in which the atmof- 

 pheric moifture, drunk up by the cutaneous and pulmonary lym- 

 phatics, is poured into the inteftines, by the retrograde motions 

 of the lafteals. This difeafe is moft fimilar to the aqueous di- 

 abetes, and is frequently exchanged for it : a diftincl inftance 

 of this is recorded by Benningerus, Cent, v Obf 98. in which 

 an aqueous diarrhoea fucceeded an aqueous diabetes, and deftroy- 

 ed the patient. There is a curious example of this, defcribed by 

 Sympfon (De Re Medica) " A young man (fays he) wasfeiz- 

 ed with a fever, upon which a diarrhoea came on, with great 

 ftupor ; and he refufed to drink any thing, though he was 

 parched up with exceffive heat : the better to fupply him 

 with moifture, I dire&ed his feet to be immerfed in cold warer ; 

 immediately I obferved a wonderful decreafe of water in the vef- 

 fel, and then an impetuous ftream of a fluid, fcarcely coloured, 

 was difchargecl by ftool, like a cataraft." 



7. There is another kind of diarrhoea, which has been called 

 cseliaca ; in this difeafe the chyle, drunk up by the laftealsof 

 the fmall inteftines, is probably poured into the large inteftines 

 by the retrograde motions of their lafteals : as in the chyliferous 

 diabetes, the chyle is poured into the bladder, by the retrograde 

 motions of the urinary branch of abforbents. 



The chyliferous diabetes, like this chyliferous diarrhoea, pro- 

 duces fudden atrophy ; fince the nourUhment, which ought to 

 fupply the hourly wafte of the body, is expelled by the bladder, 

 or redlum : whilft the aqueous diabetes, and the aqueous diar- 

 rhoea produce exceffive thirft , becaufe the moifture, which is 

 obtained from the atmofphere, is not conveyed to the thoracic 

 receptable, as it ought to be, but to the bladder, or lower intef- 

 tines ; whence the chyle, blood, and whole fyftem of glands, are 

 robbed of their proportion of humidity. 



8. There is a third fpecies of diabetes, in which the urine is 

 mucilaginous, and appears ropy in pouring it from one veflel 

 into another , and will fometimes coagulate over the fire. This 

 difeafe appears by intervals, and ceafes again, and feems to be 

 occafioned by a previous dropfy in fome part of the body, 

 When fuch a collection is reabforbed, it is not always returned 

 into the circulation ; but the fame irritation that ftimulates one 

 lymphatic branch to reabforb the depofited fluid, inverts the 



urinarv 



