Philadelphia Water Works. 193 
the President of the Lyceum. It contains, according to 
analysis, a 
_ Silex, é 16.30 parts. 
Peroxide of Cerium, > 6.16 
_. Protoxide of Iron, 10.50 
Alumine, 1.84 
ime, 12.04 
Water, 1% 
[Loss, 1.41 parts. 
4. Prof. Hall’s Catalogue of Minerals. 
_A ‘Catalogue of Minerals found in the State of Ver- 
mont and in the adjacent States, together with their locali- 
ties{ an Svo. pamphiet of 44 pages, has recently been 
published: by» Prof. Hall of Middlebury College. ‘The 
author has designed this work principally to aid those who 
attend his mineralogical lectures in making collections of 
minera!s ; and it would seem desirable that every lecturer 
On mineralogy shouid follow the example of Prof. Hall, by 
placing in the bands of his pupils a convenient index to 
the principal neighboring localities. This little work, 
however, is not a mere catalogue of minerals and lo- 
calities; but generally the most prominent characters of 
the minerals, and in some instances minute descriptions 
are given, ‘To the students of the author, and to persons 
travelling in the section to which the work 1s particularly 
adapted, this manual must be an important guide ; and 
we think it cannot be entirely uninteresting to any lover 
of the science. A work of this nature admits of continued 
improvement ; and it is presumed that future editions 
will be rendered still more interesting than the present. 
5. Philadelphia Water Works. 
By the last annual report of the Watering Committee 
of the City of Philadelphia, it appears that the success of 
the plan recently adopted for supplying that city with good 
ou" VIII.—No. 1. 95 
