IMPROVED. 243 



too thick to part with any thing by the Kidneys, 

 or at leafl fo much as it ought. And herein N.iture 

 has in a very wonderful Manner provided agninft 

 this Inconvenience, by fo near Sitantion of the 

 Kidneys to the Heart, that the Motion of the B'cod 

 may not be retarded vt'hen it comes to them, unlefs 

 it moves flower through the Heart itfelf. And in 

 fuch Cafe, it muft of Confequence move flower than 

 it fhould do near the Kidneys. 



From what has been fai'd it appears, thaffuch 

 things are Diuretick or operate by Urine, which 

 not only Simulate the Blood's Motion, by their Ir- 

 ritation of the Solids and quickening their Vibra- 

 tions ; but are fo fubtile, as to keep the Blood in as 

 Fluid a State as poffible. Therefore, Lixlvial 

 Salts, as Soap of Tartar, and the like, in the Infu- 

 iion for the Yellows, are of fuch a Nature, that they 

 hinder fuch Particles of Blood from coming int(J 

 Conta6l which would make them cohere. And on 

 this Account it is, that in all fluggiih and vifcid 

 Habits, where the Blood tends to too much Thick- 

 nefs, fuch things promote the urinary Difcharges. 



There are fundry Kinds of Diureticks morelhan 

 what^ I have mentioned, but they all aft in a Me- 

 chanical Way; to wit, either by Adding to the 

 Motion of the Blood, or by Encreafmg its Salts, of 

 which Sort aie all the Plants of the Mallows-Kind : 

 And Dr. Grenjo, a mofl faithful Recorder of Expe- 

 riments of this Nature, obferves more Salts to be in 

 Plants of this Kind, to wit, fuch as feem of a muci- 

 laginous or flimy Contexture, than in others which 

 difcover it more upon the Palate. And if Nature 

 be the beft Compounder, thofe Plants of her Pro- 

 iuaion which have thefe Salts v/rapt up in a Kind 

 3f Mucilage, mail be the bell that can be contrived 

 "or carrying off fabulous or gravelly Concretions, in 

 he Kidneys of Human Bodies: For, at the fame What kind 

 mie that Salts are added to the Blood, by the £x-ofEiure- 

 libition of Decoaions of March-Mallov/s, or the ^^^^^ P'f'- 

 ike ; thefe are fo inveloped w wrapt up in a Muci-^f/^^"^^^,^ 



