MINERALOGY.; 267 



miner alifatum corpora peregrina in- 



gre[fum. . 



a. Mineralifed with fulphur. Mar- 



cafite. Larva Pyriiace*. Sect. 



cclxxxvii. 



SECT. CCXCIII. 



5. Extraneous bodies decompofing, or in a way 

 of deftruction, Corpora peregrina in gradibus 

 defirucfionis confiderata. Mould, Humus. Turf, 

 Turla. 



A. From animals. Animal mould, Humus 

 animaiis. 



1. Shells. Humus conchaceus. 



2. Mould of other animals, Humus diver* 

 forum animalium. 



B. Vegetable mould, Humus vegetabilis. 



1. Turf, Turbci. 



a. Solid, and hardening in the air, Turba 

 folida acre irJurefcens. Is the belt of 

 this kind to be ufed for fuel, and 

 comes neareft to the pit-coals. It 

 often contains a little of the vitriolic 

 acid. 



b. Lamellated turf, Turba foliata. This 

 is in the firft degree of deflruclion. 



2. Mould of lakes, Humus lacufiris. This 

 is a black mould which is edulcorated 

 by water. 



3. Black mould, Humus ater. 



This is univerfaily known, and covers 

 the furface of that loofe earth in which 

 vegetables thrive beft *. 



• All the kinds cf mould contain fome of the inflammable 

 fubftance, which has remained in them from the vegetables or 

 animals , and they a;e moie or \zk black, in proportion as they 



contain 



