.--Slide-Valve Gears:$

A new, graphical method for Analyzing the Action of Slide-Valves,
moved by Eccentrics, Link Motions, and Cut-off Gears, offering easy
means for properly designing Valves and Valve-Gears, and for
establishing the comparative merits of their various constructions.
By HUGO BILGRAM, M.E. Illustrated. 16mo. $1.00

$CREW.--A Practical Treatise on Petroleum:$

Comprising its Geographical Distribution, its Geology, Chemistry,
Mining, Refining, Preparation, and Uses. Together with a
Description of Gas Wells and the Application of Gas as Fuel, etc.
By BENJAMIN J. CREW. Illustrated. 8vo. (In preparation.)

$CROOKES.--Select Methods in Chemical Analysis (Chiefly
Inorganic):$

By WILLIAM CROOKES, F.R.S., V.P.C.S. 2d edition, re-written and
greatly enlarged. Illustrated by 37 wood-cuts. 725 pp. 8vo. $9.50

$DAVIS.--A Treatise on Steam-Boiler Incrustation and Methods for
Preventing Corrosion and the Formation of Scale:$

By CHARLES T. DAVIS. Illustrated by 65 engravings. 8vo. $2.00

$DAVIS.--The Manufacture of Paper:$

Being a Description of the various Processes for the Fabrication,
Coloring and Finishing of every kind of Paper, Including the
Different Raw Materials and the Methods for Determining their
Values, the Tools, Machines and Practical Details connected with an
intelligent and a profitable prosecution of the art, with special
reference to the best American Practice. To which are added a
History of Paper, complete Lists of Paper-Making Materials, List of
American Machines, Tools and Processes used in treating the Raw
Materials, and in Making, Coloring and Finishing Paper. By CHARLES
T. DAVIS. Illustrated by 156 engravings. 500 pages, 8vo. $6.00

$Hand-Book of Useful Tables for the Lumberman, Farmer and
Mechanic:$

Containing Accurate Tables of Logs Reduced to Inch Board Measure,
Plank, Scantling and Timber Measure; Wages and Rent, by Week or
Month; Capacity of Granaries, Bins and Cisterns; Land Measure,
Interest Tables, with Directions for Finding the Interest on any
sum at 4, 5, 6, 7 and 8 per cent., and many other Useful Tables. 32
mo., boards. 186 pages .25

$MAKINS.--A Manual of Metallurgy:$

By GEORGE HOGARTH MAKINS, M.R.C.S.S.C.S. Illustrated by 100
engravings. Second edition rewritten and much enlarged. 8vo., 592
pages. $3.00

$ROPER.--Instructions and Suggestions for Engineers and Firemen:$

By STEPHEN ROPER, Engineer $2.00

$ROPER.--The Steam Boiler: Its Care and Manageme