378 Report on the re-examination, §c. 
thinks it may have been formed by sublimation, and accordingly 
he infers that coal may exist beneath this spot, and that the por- 
tions visible have been volatilized by the agency of trap, which 
rock he supposes, from the situation of the sandstone, lies at a 
depth of between one and two hundred feet below the bed of the 
river. If Prof. H. is right in his conjecture, the coal must be 
reached before the above mentioned depth is attained. 
Under the head of ores, we make the following extracts: 
1. Carbonate of iron at Newbury. Sp. gr. = 2.94. Consists 
of 
Carbonate of lime, = - - - - 45.67 
- magnesia, - - - 8.97 
iron, - - - - 21.76 
" manganese, - - - 16.10 
Silica and alumina, - - . 3.34 
- - - - - . 4.16 
Loss 
It is very ‘Wbtindaaté, 
2. Magnetic tron in Warwick. It is very abundant, but is 
not worked on account of difficulties experienced in its reduction. 
Sp. gr. = 4.47. Analysis. 
Oxides of iron, - - ~ - . 66.4 
Oxide of manganese, - - - - 16.6 
Silica and alumina, = - - 17.0 
3. Chrome iron ore. This ee ore is found in Chester, 
where it occurs in serpentine, in covches from 5 to 18 inches wide. 
According to Dr. Hotcanp it contains traces of platinum. 
4. Limonite( Hematite). This is abundant at several places in 
Berkshire County, where Prof. H. admits that the beds extend 
downwards into, and are embraced by the older rocks. 
5. Copperas. The amount of this annually manufactured at 
Hubbardston is seventy-five tons. 
Several new localities of galena, blende and copper-pyrites are 
indicated ; and the report concludes with brief notices of ochres, 
clays, water-cement, soap-stone and serpentine-marble. 
On the whole, the present work will be found to sustain the 
character of the more voluminous report by which it was prece- 
ded, and cannot fail of advancing the agricultural prosperity of 
the state, to an elevation corresponding to that which she has 
reached in the arts and manufactures. 
