CONTENTS 



PACK 



The Romance of the Diamond 1 



WILLIAM CBOOKES 



Making Money out of Waste 11 



DAY ALLEN WILLET 



Modern Explosives 17 



J. 8. 8. BRA ME 



A Sketch of the History of Propellants 28 



ANDREW NOBLE 



Artificial Silk. . ;_. ;...... . V, ... , . . . . ......... ,. -..i . 36 



JOSEPH CASH 



The Creators of the Age of Steel . . . .^ . * 42 



A Review 



The Anatomy of a Steel Rail 56 



HKXRY COOK BOYNTON 



The Nature and Treatment of Alloy Steel 65 



JOHN A. MATHEWS 



The Oxyhydric Process of Cutting Metals 72 



E. F. LAKE 



The Commercial Production of Oxygen 81 



ALFRED GRADENWITZ 



Why a Flame Emits Light 89 



ROBERT M. BIRD 



Marvels of a Plant's Growth and the Chemistry of 



Decay 103 



VIVIAN B. LEWES 



Coal, Its Composition and Combustion 115 



WILLIAM H. BOOTH 



223*057 



