D. VAN NOSTRAND. 31 
Rogers’ G-eology of Pennsylvania. 
3 Yols. 4to, with Portfolio of Maps. Cloth. $30.00. 
THE GEOLOGY OF PENNSYLVANIA. A Government Sur- 
vey. With a general view of the Geology of the United States, 
Essays on the Coal Formation and its Fossils, and a description 
of the Coal Fields of North America and Great Britain. By 
Henry Darwin Hogers, Late State Geologist of Pennsylvania. 
Splendidly illustrated with Plates and Engravings in the Text. 
It certainly should be in every public library „nroughout the country, and 
likewise in the possession of all students of G-eology. After the final aale of 
these copies, the work will, of course, become more valuable. 
The work for the last five years has been entirely out of the market, but a 
few copies that remained in the hands of Prof. Rogers, in Scotland, at the 
time of his death, are now offered to the public, at a price which is eren 
below what it was originally sold for when first published. 
Morfit on Pure Fertilizers. 
With 28 Illustrative Plates. 8vo. Cloth. $20.00. 
A PEACTICAL TEEATISE ON PUEE FERTILIZERS, and 
the Chemical Conversion of Eock Guanos, Marlstones, Coprolites, 
and the Grude Phosphates of Lime and Alumina Generally, into 
yarious Valuable Products. By Campbell Morfit, M.D., F.C.S. 
Sweet’s Report on Coal. 
8vo. Cloth. $3.00. ■ 
SPECIAL EEPORT ON COAL ; showing its Distribution, Classi 
fication, and Cost delivered over different routes to yarious points 
in the State of New York, and the principal cities on the Atlantic 
Coast. By S. H. Sweet. With maps. 
Colburn’s Gas Works of London. 
lämo. Boards. 60 Cents. 
. GAS WORKS OF LONDON. By Zekah Colbukn.