I. CHEMISTRY AND METALLURGY.--Annatto.-Analyses of the same.--By
WM. LAWSON
Aluminum.--By J.A. PRICE.--Iron the basis of civilization.--
Aluminum the metal of the future.--Discovery of aluminum.--Art
of obtaining the metal.--Uses and possibilities
II. ENGINEERING AND MECHANICS.--The Use of Iron in Fortification.
--Armor-plated casements.--The Schumann-Gruson chilled iron
cupola.--Mougin's rolled iron cupola.--With full page
of engravings