84 Internal Improvements of the State of Pennsylvania. 
a of earth and acids into which this mineral has been 
decomposed, 
Silica, Process IL. and'dBsamcasoss> - 24.735 
Alumina, IIT. . “ - 10.740 
Lime, IV. 4.55 VII. 1. 19=. 4 “ ~ 6.740 
Soda, VI. - - - -- 1.970 
Phosphoric acid, vill. - - - 1.740 © 
Oxide of Iron, VII - - - - .070 
Foreign matter, II. == - - 015 
Water, I. - - Scie - 4,290 
49.300 
Loss, partly water and ante? of Lime. - .700 
50.000 
Or considered asa saline compourid, its conipontiop would be, in 
50 parts, as analytically determined, 
Bisilicate of Alumina, - - 30.040 
Bisilicate of Lime, - =) wae 
Subsilicate of Soda, - - - 2.485 
Phosphate of Lime, = - - 2.970 
Oxide of Iron, aud bees Mater, - 085 
Water, - - - 4,290 
49.300 
The loss renders it necessary to express the soda salt as a subsi- 
licate, but it probably exists as a silicate in the mineral. It is not 
known that the weight of water is determined with perfect accu- 
racy. So small a quantity of the specimen was given me that [I 
could not make any preliminary trials, or check the results by other 
processes. 
Art. IX.—Internal Aeiriiniaas of the State of Pennsylvania ; 
y Epwarp Minter, Civil Engineer. 
It is generally known to the readers of the Journal of Science, that 
the state of Pennsylvania has been, for several years, engaged in a 
system of Internal Improvements, of great extent and importance, 
but probably, only few of them are acquainted with the character of 
