% 



183 



Outlines of the Miner alopj and Geology 



CLASS lU.—LrFLAMMJBLE SUBSTAJ^'CES. 



SPECIES l.—UTDllOGEJ^ GAS. 



Subspecies I. — Carhuretted Hydrogen Gas. 



Carburettecl fljdrosen Gas, Cleaveland. p. 38G. Idem, of Chvmists. Fire 

 (lamp of" Mifl^ers. 



This sas is dis en cased in abundance from wet marshes or 



from the bottoms of small pools, or ditches where vegetab 



matter is decomposing ; the air bubbles, so 1 

 rising through the water, consist of this gas. 



quently observed 

 By filling a bell 



glass; or a tumbler with water and invertins; it over these bubbles, 

 the gas may be readily obtained by stirring the mud at the bottom 



of the pool, with a stick, 

 fire and burns with pale 1 



and hydrogen ; oxygen gas and carbonic acid 

 mixed with it. 



When a flame is applied to it, it takes 

 laish light. It is composed of carbon 



sas are sometimes 



SPECIES ll.—FEJlT. 



\ 



Two varieties of Peat are found in large quantities in this 

 nity, viz. the Fibrous Peat and the Compact Peat, 



^ 



Variety I. — Fibrous Peat 



\ 



Cleaveland, p. 416, 



This variety has a brownish colour, and is composed of 



and parts of pi 



f partial decomposition 



some 



ery loose texture, and the different 



adily detached from each other : others 



firm and 



appear to be cemented tos:eth 

 a state of more cor 



T by some vegetable substance, in 

 plete decomposition. This variety is very 



