EDWIN E. SLOSSON, M.S., PH.D.

LITERARY EDITOR OF THE INDEPENDENT, ASSOCIATE IN COLUMBIA SCHOOL OF JOURNALISM

Author of "Great American Universities," "Major Prophets of Today," "Six Major Prophets," "On Acylhalogenamine Derivatives and the Beckmann Rearrangement," "Composition of Wyoming Petroleum," etc.

WITH MANY ILLUSTRATIONS

NEW YORK THE CENTURY CO.

Copyright, 1919, by THE CENTURY CO. Copyright, 1917, 1918, 1919, by THE INDEPENDENT CORPORATION Published, October, 1919

From "America's Munitions"

THE PRODUCTION OF NEW AND STRONGER FORMS OF STEEL IS ONE OF THE GREATEST TRIUMPHS OF MODERN CHEMISTRY

The photograph shows the manufacture of a 12-inch gun at the plant of the Midvale Steel Company during the late war. The gun tube, 41 feet long, has just been drawn from the furnace where it was tempered at white heat and is now ready for quenching.

TO MY FIRST TEACHER

PROFESSOR E.H.S. BAILEY

OF THE UNIVERSITY OF KANSAS

AND MY LAST TEACHER

PROFESSOR JULIUS STIEGLITZ

OF THE UNIVERSITY OF CHICAGO