Miscellaneous Localities of Minerals. 19 
18. Favosite, and other organic remains, at Lebanon, New- 
York. 
Soapstone of Middlefield, Mass. 
Correction of a passage in Dr. Dwight’s Travels. 
In the first volume, second letter, of President Dwight’s 
Travels, occurs the following paragraph : 
‘‘ Magnesian stones are found in New-Haven, Milford, 
Stamford, and several other places. A quarry of this spe- 
cies of stone, at Plainfield, in the county of Hampshire, has 
been wrought to a considerable extent. I have seen a house 
faced with it in Northampton.” 
There is an inaccuracy in this statement, no stones of this 
kind having been found at Plainfield The house referred 
to is, doubtless, that on Round Hill, built, as the owner in- 
formed me, of steatite, brought principally from Middle- 
field. 
Were these travels a work of ordinary merit, so slight an 
error would not be worth noticing. But it is desirable that 
the few errors contained in a work so characterized by 
accuracy should be pointed out, before passing into a second 
edition. 
March 25th, 1825. 
6. Notice of Firestones used in the Manufactories of Glass. 
Extract of a letter to the editor, from Mr. John S. Foster, dated Boston> 
November 12, 1824. 
In all processes where the agency of heat is required, it is 
a desideraitum to obtain those substances for the construction 
of furnaces and melting pots which will most effectually 
resist its action; and we may attribute to the neglect or ig- 
norance of these, the failure of many American manufactories, 
which were susceptible of profit. These remarks are peculiar- 
ly applicable to the process of glass making ; and the hope of 
improvement has led lately to various experiments, at the 
Boston Glass Works, which promise permanent utility. No 
progress seems to have been made, very recently, in the 
