, [« 97 ] ■ 
lying in the Carlfbad waters, and that in a very 
little time. Thefe bodies in the {pace of a night will 
be covered with a tophaceous cruft, which continu- 
ally increafes. But human calculi, though hard in 
themfelves, are not incrufted thereby ; but are rather 
diftolved ; which is the more remarkable. The 
fame effects are obferved upon pieces of the hardeft 
cheefe, which fwell in thefe waters, and are changed 
into a kind of pultice. 
In the treatife before us our author has given the 
detail of many experiments, which prove the folvent 
power of thefe waters. I fhall lay a few of them 
only before you, from which an opinion both of 
our author’s exactnefs in making them, as well as 
how far he is juftified in his conclufions, may be 
formed. And here I rauft obferve, which fhould 
be a very comfortable con federation for the inhabit- 
ants in thefe parts, that our author has been obliged 
frequently to fufpend his refearches for want of hu- 
man calculi, which is a difeafe exceedingly rare in 
Bohemia. 
June 20, 1749. A ftone of a brown colour, which 
weighed near two ounces and half, was placed in a 
china bafon near that fource, which is called Brudel, 
in fuch a manner as to be continually covered with 
the warm water. Upon the next day the external 
cruft began to grow foft ; upon the third, you might 
make an impreftion thereupon with your nail as up- 
on cheefe; upon the fourth and fifth, it was dil- 
folved to the nucleus ; upon the fixth, the nucleus 
itfelf was diftolved, and in the bottom of the bafon 
there was left a white vifcid mafs, like pultice, or 
newly fteeped cheefe : this was impalpable between 
