The articles comprised in this book relate to a variety of subjects, which are of importance in the practical metallurgy of lead, and especially in connection with the desulphurization of galena, which is now accomplished by a new class of processes known as “Lime Roasting” processes. The successful introduction of these processes into the metallurgy of lead has been one of the most important features in the history of the latter during the last twenty-five years. Their development is so recent that they are not elsewhere treated in technical literature, outside of the pages of the periodicals and the transactions of engineering societies. The theory and practice of these processes are not yet by any means well understood, and a year or two hence we shall doubtless possess much more knowledge concerning them than we have now. Prompt information respecting such new developments is, however, more desirable than delay with a view to saying the last word on the subject, which never can be said by any of us, even if we should wait to the end of the lifetime. For this reason it has appeared useful to collect and republish in convenient form the articles of this character which have appeared during the last few years. W. R. INGALLS. AUGUST 1, 1906. CONTENTS PART I NOTES ON LEAD MINING PAGE SOURCES OF LEAD PRODUCTION IN THE UNITED STATES (WALTER RENTON INGALLS) 3 NOTES ON THE SOURCE OF THE SOUTHEAST MISSOURI LEAD (H. A. WHEELER) 10 MINING IN SOUTHEASTERN MISSOURI (WALTER RENTON INGALLS) 16 LEAD MINING IN SOUTHEASTERN MISSOURI (R. D. O. JOHNSON) 18 THE LEAD ORES OF SOUTHWESTERN MISSOURI (C. V. PETRAEUS AND W. GEO. WARING) 24 PART II ROAST-REACTION SMELTING SCOTCH HEARTHS AND REVERBERATORY FURNACES LEAD SMELTING IN THE SCOTCH HEARTH (KENNETH W. M. MIDDLETON) 31 THE FEDERAL SMELTING WORKS, NEAR ALTON, ILL. (O. PUFAHL) 38 LEAD SMELTING AT TARNOWITZ (EDITORIAL) 41 LEAD SMELTING IN REVERBERATORY FURNACES AT DESLOGE, MO. (WALTER RENTON INGALLS) 42 PART III SINTERING AND BRIQUETTING THE DESULPHURIZATION OF SLIMES BY HEAP ROASTING AT BROKEN HILL (E. J. HORWOOD) 51 THE PREPARATION OF FINE MATERIAL FOR SMELTING (T. J. GREENWAY) 59 THE BRIQUETTING OF MINERALS (ROBERT SCHORR) 63 A BRICKING PLANT FOR FLUE DUST AND FINE ORES (JAS. C. BENNETT) 66 PART IV SMELTING IN THE BLAST FURNACE MODERN SILVER-LEAD SMELTING (ARTHUR S. DWIGHT) 73