^/i^j" matter at onetime than at another: or elfe that it 
was much more fatiated or abounded with this ponderous 
Tr(£cipitate at one time than at another, and fo laid it 
over with thicker Cruji'm asfiiort a time. 
If we might be allowed briefly to examine the caufes 
that have been affigned to the Produ^lion of this Con- 
crete-, I think we cannot well grant /^e^j^ in th^ Sidneys 
to be a probable efficient Caule; a much more Int nfe 
Heat than is poilible to be found here, being neceffary 
to majee Bric^, or bake Sand and Earth into Stone. Nor 
is it neceflTary to derive the material Caufefrom fuch a 
flimy and roapy or mucilaginous Indifpofition of the hu- 
mours, that may perhaps coagulate and harden into a 
Stone. Such a vifcous Vrine. being lefs apt to precipitate 
this gritty matter than more thin and limpid Urine. For 
I have found in more than one, where the Urine has of- 
ten been fo roapy and ftringy that it would drawdtet into 
threads upon the application of a ftick s but ye^ve ne- 
ver difcover'd fymptoms of the Stone in the F^dn ys or 
£/^^^i^r ol fuchPerfons. Nor do I believe that an ^cid 
meeting with fome^/y^^//^?/ may be reafonably concluded 
to conftitute this fo firm and folid 2i Concrete. Which 
does, not at all hold good in our Analyfis^ nor does it 
feem reafonable, that Jcids fliould m2iktt]\\s CenneSlion, 
fince nothing that I know of but ^cids will make the 
Iq2l^ Solution. Now if Acids make the firft Bond of Vni^ 
QUy we may exped: from them rather that they fhould 
ftrengthen and confirm than fliatter this Confederacy in 
pieces. 
Nor can I charge any putrifying morbid Ferment in 
the K^dnies with fuch ^ Coagulating power as will anfwer 
for the Product. This Hypothecs of Helmbnt being very 
precarious, and feems grounded x)n one uncertain In- 
ftance, of a Perfon that upon eating J/paragus, from 
that 
