230 Miscellaneous Notices in Mineralogy, Geology, &. 
shall both be gratified if we can add any thing to the stock 
of otal knowledge by the best observations we can make. 
Se Lime for water Cement. 
The following a ce of the lime used in the sub-aqueous constructions of 
the — canal i int the state of N ew-York, we owe to the kindness of W. W. 
Woolse v, Esq. 1, but we have 
not yet ‘been able to subject them to any experiments. 
Extract of a detter from Benjamin W; right, Esq. chiefs Engi- 
meer of the Erie Canal, to W. W. Woolsey, Esq. of 
_ New-York, dated Rome, Suis 24, 1820. 
Dear Sir, 
The specimen of Argillo-ferruginous: limestone, herewith 
presented, is found in great abundance. in the counties of 
nondaga and Cayuga, in the state of New-York. 
Wien foud:in-plare, itis pant aadenthe the blue ones 
is uniformly overlai yn ear The grey is the up- 
per and is n large heavy Casey ; the whole 
SIX OT eight ysabe. in fikacs. The blue which next occurs, 
is various in thickness, and from it is made the beautiful 
white lime. Under the blue lies the first described, which 
is found to be a superior water cement, and is used ve! 
successfully in the stone work of the Erie canal, and believ- 
ed to be equal to any of the kind found in any other coun- 
try. I cannot give you the analysis—if convenient to give a 
country west to ee and Ponce further west. It is 
pulverized (as it will not slack) and then used by mixing two 
bea lime and one A eisai Tt hardens best under water, 
