No. XI. 



.Analysis of the Hydraulic Lime used in constructing the Erie 

 Canal in the State of New York. By Henry Seybert. — 

 Communicated on the i9tkofJuly, 1822. 



Philadelphia, iOth July, 1833. 



Deau Sin, 



Agreeably to your request, I examined the Hydrau- 

 lic Linie which you presented to nie, and herewith transmit 

 to you the detail of my experiments. In Professor Silli- 

 nian's Journal, Vol. III. No. 2, p. 231, we have a statement 

 of Dr. Hadley's analysis of this substance, viz. carbonic acid, 

 35.05; lime, 25; silex, 15.05; alumina, 16.05; water, 5.03; 

 oxide of iron, 2.02 ;=98.20. On examining these results, 

 it was evident that the proportion of carbonic acid was too 

 great for the lime : from my analysis, it appears that he 

 overlooked the magnesia, which forms an essential consti- 

 tuent of this mineral. 



I am. 



Very respectfully. 



Your obedient servant, 



H. SEYBERT. 

 Dr. James Mease. 



VOL. II. II 2 



