No. 50.] 67 
part of September. During the rest of the year they are entirely dry. 
Bubbles of nitrogen gas rise from the bottom of these springs, as at 
Lebanon ; a circumstance still more remarkable in this case, as the 
waters are quite cold. 
It is scarcely necessary to observe, that the minerals which are usu- 
ally found in primary regions occur in this county. 
Thus we have quartz, feldspar, mica, and hypersthene is said also to 
be a common mineral. It must be confessed, however, that I am not 
yet prepared to do justice to the mineral resources of this county. 
FULTON COUNTY. 
I regret that it is not in my power to say any thing at present con- 
cerning the mineralogy of this county. 
GENESEE COUNTY. 
This is one of the rich agricultural counties of Western New- York 
which is perhaps less dependent upon mineral resources than any other. 
Indeed we can hardly expect to find minerals abundant in a region so 
generally cultivable and fertile. It is not, however, entirely without 
interest in this respect. Among other objects worthy of notice I may 
mention particularly the acid or sour springs in the town of Byron, and 
which owe their acidity to the presence of pure sulphuric acid in a di- 
luted form. This interesting occurrence was noticed many years ago, 
and it is almost without a parallel, whether we refer to the strength of 
the acid or the large quantity which has been formed. My report for 
1838 contains a detailed account of some of these springs to which I 
must refer for further information in regard to them. 
Brine springs have also been found in this county, but their waters 
are not of strength sufficient to admit of their being advantageously 
used in the manufacture of salt. There are, moreover, some sulphur 
springs and one or two unimportant localities of sulphate of lime, sul- 
phate of magnesia and sulphate of iron. 
GREENE COUNTY. 
This county, although very different in its character from the preced- 
ing, does not offer much that is interesting to the mineralogist. It 
contains, however, some useful mineral productions. 
