D. VAN NOSTliAND. 
Jacob on Retaining Walls. 
18mo. Boards. 50 cts. 
PEACTICAL DESIGNING OF RETAINING WALLS. By 
Aethüb Jacob, A. B. 
Campin on Iron Roofs. 
Large 8vo. Cloth. $2.00. 
ON THE CONSTEUCTION OE IEON EOOES. A Theoretical 
and Practical Treatise. By Feancis Campin. With wood-cuts 
and plates of Eoofs lately executed. 
« The mathematical formulas are of an elementary kind, and the proeesa 
admits of an easy extension so as to embraoe the prominent varietiea of iron 
truas brido-ea. The treatise, though of a praotieal scientific character, may be 
easily mastered by any one familiär with elementary mechanica and plane 
trigonometry.” 
Holley’s Railway Practice. 
1 vol. folio. Cloth. $12.00. 
AMEEICAN AND EUEOPEAN EAILWAY PEACTICE, in 
the Economical Generation of Steam, including the materials 
and construction of Coal-burning Boilers, Combustion, the Varia 
ble Blast, Vaporization, Circnlation, Super-heating, Supplying 
and Heating Feed-water, &c., and the adaptation of W ood and 
Coke-burning Engines to Coal-burning ; and in Permanent Way, 
including Eoad-bed, Sleepers, Eails, Joint Fastenings, Street 
Eailways, &c., &c. By Alexander L. Holley, B. P. With 77 
lithographed plates. 
« This is an elaborate treatise by one of our ablest civil engineers, on the con 
struction and use of locomotives, with afew chapters on the building of Bail- 
ro- ds * * * All these subjeets are treated by the author, who is a 
first-class railroad engineer, inboth an intelligent and intelligible manner. The 
faets and ideas are well arranged, and presented in a clear and simple style, 
accompanied by beautiful engravings, and we presume the work will be regard- 
ed as indispensable by all who are interested in a knowledge of the construc 
tion of railroads and rolling stock, or the working of locomotives. 'Scientific 
American.