Geology and Natural History. 147 
Considering all of its properties, I may say that it possesses 
uch in mon with the recently discovered mineral called 
albertite, a species of solidified petroleum, and also with what is 
known as torbanite. These two varieties are highly valued by gas 
o tw pe these 
Analysis shows it to contain in one hundred parts 6°02 per cent of 
water and moisture, 39°95 per cent of volatile matter (gas and 
tarry oil), 54-03 per cent of fixed residue, consisting of coke and ash. 
8 much confusion exists in the nomenclature of the mineral 
fuel of Colorado, I would propose, as I recently did to Professor 
Hayden, to give up entirely the term lignite as a special class 
hame. If we call our mineral fuel lignite, we must conclude that 
anthracite, or possess an organic structure. The term lignite 
oe be dropped, as being inapplicable when applied to our min- 
lass 
— Northeastern Ireland ; by Prof. Epwarp Hutt. ‘ 
oe Assoc, Aug., 1874.)—The Antrim igneous rocks, which in- 
clude those of the Giant’s Causeway, are referred to the closing 
part of the Eocene period and the whole of the Miocene. The 
reed eruptions in vast sheets, covering in some places beds of 
Shite and others of pisolitic limonite. The whole thickness of the 
ie to be 3,000 to 4,000 feet. In both regions the thickness has 
“ reduced by denudation. Mr. Hall states that the thousands 
Several ; : 
the strata, thousand feet—were made without any crumpling of 
