[ 62 ] 
an feveral Parts of Germany. It is the Opinion of a 
great Naturaliff, and there is a great Probability of 
its being the Truth, that thefe Figures are occafioned 
by mineral Exhalations, which ftaining the original 
foft Matter of which the Slate is afterwards formed, 
the Traces remain and continue vifible after the Slate 
has attained its ftony Confidence, whence that Variety 
of natural Pidtures to be feen in thefe Specimens. 
Terr#, Earths. Thefe are of many different 
Kinds, and are divided into fimpie and compound. 
The fimpie and fine Earth is eafily friable, and dif- 
lolves in a Liquid. When ufed in Medicine, the 
different Kinds have various Names, as Bolus Ar- 
mena t Armenian Bole, vulgarly called Bole Armo - 
Tiiac ; the beft is of a palifh red, fbft and fattifh to 
the Palate, and adheres ftrongly to the Tongue: 
It is ufed as an Aftringent and a Vulnerary. Terra 
Lemnia , Terra Sarnia^ Terra Sigillata — Thefe are 
all Aftringents and Abforbents, but have not the 
Virtue of the Bolus Armena firft mentioned. We 
muff now add to thefe the common vegetable Earth, 
Boles, Clay, Marie, Ochre, and Tripoli, and they 
will nearly comprehend all the fimpie Earths. The 
compound Sorts are more or lefs impregnated with 
faline, fulphurous, or other mineral Qualities, and 
have fometimes other Mixtures. 
Calculi , Stones or Bails found in the Stomach or 
other Parts of the Inteftines of Animals. The lar- 
geft are found in Horfes, and fome of an oval 
Shape in the Stomachs of Camels: The Rhinoceros 
likewife fometimes has them; and hairy Balls are 
often found in the Maws of Oxen. This is the 
Cafe of thofe that are flailed to fat for the Market j 
the Beafl will fometimes, when almoft fit for Slaugh¬ 
ter, fuddenly pine and lofe its Flefh, continually 
licking its Hide, by which Means the Balls of Hair 
gather 
