SCIENTIFIC AMERICAN SUPPLEMENT NO. 1178 NEW YORK, JUNE 25, 1898. Scientific American Supplement. Vol. XLV., No. 1178. Scientific American established 1845 Scientific American Supplement, $5 a year. Scientific American and Supplement, $7 a year. TABLE OF CONTENTS.  PAGE. I. ARCHÆOLOGY.—Tombs of the First Egyptian Dynasty—By Ludwig Borchardt 18767 II. ANTHROPOLOGY.—The Milestones of Human Progress 18766 III. BIOGRAPHY.—The Queen Regent and Alfonzo XIII.—1 illustration 18755 IV. BOTANY AND HORTICULTURE.—Rose Psyche—1 illustration 18768 V. CIVIL ENGINEERING.—The Lock of the Dortmund-Ems Canal at Henrichenburg.—1 illustration 18776 VI. ELECTRICITY.—The Development of the Central Station—By Samuel Insull 18774 VII. MARINE ENGINEERING.—Steering Gear of North German Lloyd Steamers "Coblentz," "Mainz" and "Trier."—2 illustrations 18777 VIII. MEDICINE AND HYGIENE.—Sleep and the Theories of its Cause 18768 IX. MISCELLANEOUS: Engineering Notes. 18771 Electrical Notes. 18771 Selected Formulæ. 18771 X. NATURAL HISTORY—Wild and Domestic Sheep in the Berlin Zoological Garden.—8 illustrations 18772 XI. PATENTS.—Patents.—By James W. See 18773 XII. PHOTOGRAPHY.—Amateur Chronophotographic Apparatus.—2 illustrations 18769 XIII. STEAM ENGINEERING.—Combined Steam Pumping and Motive Power Engine.—1 illustration 18778 XIV. TECHNOLOGY.—The Reclaiming of Old Rubber.—By Hawthorne Hill 18769 XV. WARFARE.—The American "Regular."—By the English correspondent of the London Times on board the United States transport "Gussie." 18776 THE QUEEN REGENT AND ALFONZO XIII. THE QUEEN REGENT AND HER SON, KING ALFONZO XIII. OF SPAIN.