MINERALOGY. iCy 
mineralifatum corpora peregrina in- 
greffum» 
a. Mineralifed with fulphur, Mar- 
cafite. Larv^ Pyritace^. Se^. 
cclxxxvii. 
SECT. CCXCIII. 
5. Extraneous bodies decompofing, or in a way 
of deftrudion, Corpora peregrina in gradibus 
dejlrucfionis confidcrata. Mould, Humus, Turf, 
Purha, 
A* From animals. Animal mould. Humus 
anlmalis. 
1. Shells. Humus conchaceus, 
2. Mould of other animals. Humus diver- 
Jorum animalium, 
B* Vegetable mould. Humus vegetabilis, 
1. Turf, Purha. 
a. Solid, and hardening in the air, Turba 
folida aere indurefcens. Is the bell of 
this' kind to be ufed for fuel, and 
comes neareft to the pit-coals. It 
^ often contains a little of the vitriolic 
acid, 
h, Lamellated turf, ^urba foliat a. This 
is in the firft degree of deftrudlion. 
2. Mould of lakes. Humus lacujiris. This 
is a black mould which is edulcorated 
by v/ater. 
3. Black mould. Humus ater. 
This is univerfally known, and covers 
the furface of that loofe earth in which 
vegetables thrive bell 
• All the kinds of mould contain feme of the inflammable 
fubftance, which has remained in them from the vegetables or 
animals ; and they are more or lefs black, in proportion as they 
contain 
