f 896 ] 
fuccefs, the late Mrs. Stephens's medicine, with the 
ftridteft obfervance of all the cautions, faid to be 
neceftary in courfes of that medicine. And, though 
he allows every thing to be true that has been laid 
down by Dr. Whytt and others in relation to oyfter- 
fhell lime-water, he does not fcruple to aflert, that 
the Carlfbad waters, which, as will hereafter appear, 
have great analogy to caicarious waters, are a far 
more excellent folvent for the ftone in the kidneys 
and bladder than any lime-water. Of this truth he 
is fatisfied by various experiments, feveral of which 
were made by himfelf alone, and others in conjunc- 
tion with our learned and ingenious brother Dr. Lieber- 
kuhn, whofe exadtnefs as well as fidelity in making 
experiments of this kind no one will queftion. 
Dr. Springsfeld, in atreatife upon the Carlfbad wa- 
ters, publifhed by him in the year 1 749, has fhewn 
by undoubted experiments, that thele waters partake 
always of an alcaline principle ; for every pint of 
them, befides the neutral purging fait, contains three 
grains of alcaline fait, and ten grains of caicarious 
earth ; for which reafon they ferment with every 
fpecies of acids. I before mentioned, that thefe waters 
have great analogy with lime-water 3 and if they 
continue in the baths for any confiderable time, they 
not only turn milky, like lime-water, but have a pel- 
licle upon them as that water is obferved to have. 
They have likewife a gently conftringing tafte 3 that 
was it not for their faline tafte they could not eafily 
be diftinguifhed from lime-water. 
It muft here be premifed, that all hard bodies, 
viz. pieces of wood, bone, ftones, earthen veftels, 
bits of ftraw, and fuch-like, are incrufted over* by 
lying 
