62 
[Assembly 
Dover, which was of a snow-white colour, had a granular texture, and 
was as friable as loaf sugar, gave upon analysis, the following results 
in 100 parts, viz : 
Carbonate of lime, 60 . 50 
Carbonate of magnesia, 39.50 
There are in this county several localities of galena, but they have 
not been thought of sufficient importance to lead to much expenditure 
in exploring them. The veins of ore are similar to those found in Co- 
lumbia county, and it is not probable that they will ever be of much 
account in an economical point of view. 
Peat and marl are found here in abundance. The latter must be of 
great value in a region where agriculture is a pursuit of so much im- 
portance as it is in Dutchess. 
To this list of useful minerals, must be added another which is rare- 
ly met with in quantities large enough for profitable exploration. I refer 
to graphite, or black-lead, as it is commonly called. This substance 
has been found in considerable abundance in a mine which has been 
opened on the farm of Mr. Peter Dewint, two and a half miles south- 
east of Fishkill landing. Several tons have been obtained here and 
sent to market. It occurs in a vein in the granite, several inches wide 
at the surface, and increasing gradually in descending to two or three 
feet. About 40 or 50 feet of this vein are exposed, and there appears 
to be every indication that there is an abundant supply of the mineral. 
The specimens which we obtained here are both foliated and granular, 
and are of sufficient purity for nearly all the purposes to which graphite 
is applied. There is said to be another vein of a similar kind at Fishkill 
Hooks. 
Of mineral springs we only notice one from which sulphuretted hy- 
drogen is evolved, and one from which arises an inflammable gas, said 
to be carburetted hydrogen. 
The following minerals are also found in this county, viz : 
Calcareous spar, including stalactite, 6cc. 
Crystallized quartz. 
Asbestus — Associated with dolomite. 
Gibbsite — This very rare mineral was found in considerable abun- 
