No. 275.] 
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4. Lead. 
Galena, or sulphuret of lead. 
Sulphate of lead. 
Carbonate of lead. 
Molybdate of lead.? 
Vauquelinite. 
5. Bismuth. 
Native bismuth. 
6. Copper. 
Pyritous copper. 
Carbonate of copper. 
Rutile. 
Crichtonite. 
7. Titanium. 
Titaniferous iron. 
Sphene. 
8. Molybdenum. 
Sulphuret of molybdenum. 
9. Arsenic. 
Orpiment, or yellow sulphuret of arsenic. 
10. Silver. 
Native silver. 
Sulphuret of silver. 
In continuing my remarks upon the Mineralogy of the State, it will 
fee convenient to follow the order here given. I shall, however, confine 
my attention chiefly to the more useful minerals. 
Gaseous Mine^ials. 
The nature of these bodies will be sufficiently understood from the 
definitions given in the table. 
3. The first two, viz. Hydrogen and Carburetied hydrogen, are found 
among the gases evolved by many of our springs. Hydrogen gas is 
seldom abundant in its pure uncombined form, but carburetted hydro- 
gen often contains an excess of hydrogen. Both these gases are cha- 
racterized by their inflammability, and by their being destitute of the 
offensive odour of sulphuretted hydrogen gas. 
Carburetted hydrogen is evolved by numerous springs in our State, 
extending from the valley of the Hudson to the shores of Lake Erie. 
In my last report I gave an account of such gas springs as were known 
to me at the time it was written; during the past season I have added a 
few others to the list, and the final report will embrace as complete a 
view as I can prepare of this interesting subject. 
