ace, by
G.C. FOSTER, F.R.S. Illustrated by three colored plates and 404
wood-cuts. 8vo., 848 pages $6.00

$WIGHTWICK.--Hints to Young Architects:$

Comprising Advice to those who, while yet at school, are destined
to the Profession; to such as, having passed their pupilage, are
about to travel; and to those who, having completed their
education, are about to practise. Together with a Model
Specification involving a great variety of instructive and
suggestive matter. By GEORGE WIGHTWICK, Architect. A new edition,
revised and considerably enlarged; comprising Treatises on the
Principles of Construction and Design. By G. HUSKISSON GUILLAUME,
Architect. Numerous Illustrations. One vol. 12mo. $2.00

$WILL.--Tables of Qualitative Chemical Analysis.$

With an Introductory Chapter on the Course of Analysis. By
Professor HEINRICH WILL, of Giessen, Germany. Third American,
from the eleventh German edition. Edited by CHARLES F. HIMES. Ph.
D., Professor of Natural Science, Dickinson College, Carlisle, Pa.
8vo. $1.50

$WILLIAMS.--On Heat and Steam:$

Embracing New Views of Vaporization, Condensation, and Explosion.
By CHARLES WYE WILLIAMS, A.I.C.E. Illustrated 8vo. $3.50

$WILSON.--A Treatise on Steam Boilers:$

Their Strength, Construction, and Economical Working. By ROBERT
WILSON. Illustrated 12mo. $2.50

$WILSON.--Cotton Carder's Companion:$

In which is given a description of the manner of Picking, Baling,
Marketing, Opening, and Carding Cotton; to which is added a list of
valuable Tables, Rules, and Receipts, by FOSTER WILSON. 12mo. $1.50

$WILSON.--First Principles of Political Economy:$

With Reference to Statesmanship and the Progress of Civilization.
By Professor W.D. WILSON, of the Cornell University. A new and
revised edition. 12mo. $1.50

$WOeHLER.--A Hand-book of Mineral Analysis.$

By F. WOeHLER, Professor of Chemistry in the University of
Goettingen. Edited by HENRY B. NASON, Professor of Chemistry in the
Renssalaer Polytechnic Institute, Troy, New York. Illustrated 12mo.
$3.00

$WORSSAM.--On Mechanical Saws:$

From the Transactions of the Society of Engineers, 1869. By S.W.
WORSSAM, JR. Illustrated by eighteen large plates. 8vo. $2.50

* * * * *

$RECENT ADDITIONS.$

$ANDERSON--The Prospector's Hand-Book:$

A Guide for the Prospector and Traveler in Search of Metal Bearing
or other Valuable Minerals. By J.W. ANDERSON. 52 Illustrations.
12mo. $1.50

$BILGRAM