[ xk 3 
and agats, we might ftill have feen whole col*- 
ledions full of them with fuch imaginary 
figures. 
Stones that are found in animals and fillies, 
are partly compounded of phlogifton, falts, and 
a fmall quantity of earth, and partly confift of 
the fame matter with animal bones, and can 
therefore with as little reafon have a place in a 
.mineral fyftem as the ftones of fruits. Soot, 
tartar, yeaft, and things of fuch nature, have too 
great affinity to the vegetable kingdom, and 
are never to be met with under the furface of 
the earth ; wherefore they may in Botany be 
confidered in the fame manner as regales, 
glafles, and flags are in Mineralogy. 
The hair-balls found in animals, and felt, 
differ from one another in that the former are 
worked together by means of the periftaitic 
motion in the bo-wels of the animals, and the 
latter by the art of the feltm.onger. May not 
all thefe flones of animals therefore be ranked 
among the reUBa animalia ? 
By all this it is very evident, that my chief 
care has been to treat the minerd king- 
dom in fuch a manner, that thofe whofc 
principal ffudy it is, may avoid every thing un- 
neceffary and fuperfluous i and by a perfedt 
knowledge of the fubjedts be brought to con- 
fider how to employ them to the beft advan- 
tage 5 whereby I hope that the pleafure of col- 
ledling minerals will rather encreafe than be 
difcouraged. If feme objedls are thrown out 
from mineral colledtions on account they do 
b 2 not 
