[ 224 ] 
Moft of the Rocks about Carlsbad are an Aggre- 
gate of Spatum , Mica , Quartzum y Rubrica> cum 
Matrice Lapidis Calcarii y and cleave into Rhom- 
boids. The Soil on the Side of the Mountain is 
made by the Difi'olution of fuch Rocks intermixed 
with fome vegetable Earth ; and the whole Surface is 
covered with the leaft difl'olvable Parts, often ad- 
hering together in Mafl.es by the Intervention of a 
limy Matter like incruftcd Spatum. And I found 
higher up the Mountain fome Rocks moundering 
into fuch Soil. 
The Carlsbad Waters give a good deal of neutral 
Salt by boiling and cryftallizing. From 1080 lb. cf 
Water xxii Ounces of pure Salt. I fend you fome 
which I prepared myfelf, fufpe&ing the Apothecary 
might adulterate it to increafe the Quantity. 
My Thermometer being broke, I procured one of 
a Friend : But not knowing of what Conftrudion it 
was, I tried it in the following manner : In melting 
Ice the Mercury fell to 28 -f of its equal Parts, and 
by the Heat of my Body it rofe to 66 of thofe Parrs. 
This Thermometer held into the Sproudle Fountain 
rofe by its Head to 96, and in the Mill-Fountain 
to 67. 
About twenty Miles from Carlsbad to the South- 
weft near the Town of Eyra , is a cold Spring of 
Mineral Waters, much in Ufe in thefe Countries. 
This gives alfo a Salt much of the fame Kind. To 
the South from Carlsbad about twenty five EngliJ ). ; 
Miies are likewife feveral cold Springs : One of 
which is much richer in this fame Kind of Salt than 
the former. It belongs to the Monaftery of Toe pie. 
In the Winter, when they boil this Water, from x lb. 
of 
