CONTENTS: ARCHAEOLOGY.-Tombs of the First Egyptian Dynasty -- By Ludwig Borchardt ANTHROPOLOGY. -- The Milestones of Human Progress BIOGRAPHY. -- The Queen Regent and Alfonzo XIII. -- 1 illustration BOTANY AND HORTICULTURE. -- Rose Psyche -- 1 illustration CIVIL ENGINEERING. -- The Lock of the Dortmund-Ems Canal at Henrichenburg. -- 1 illustration ELECTRICITY. -- The Development of the Central Station -- By Samuel Insull MARINE ENGINEERING. -- Steering Gear of North German Lloyd Steamers "Coblentz," "Mainz" and "Trier." -- 2 illustrations MEDICINE AND HYGIENE. -- Sleep and the Theories of its Cause MISCELLANEOUS: Engineering Notes. Electrical Notes. Selected Formulae. NATURAL HISTORY -- Wild and Domestic Sheep in the Berlin Zoological Garden. -- 8 illustrations PATENTS. -- Patents. -- By James W. See PHOTOGRAPHY. -- Amateur Chronophotographic Apparatus. -- 2 illustrations STEAM ENGINEERING. -- Combined Steam Pumping and Motive Power Engine. -- 1 illustration TECHNOLOGY. -- The Reclaiming of Old Rubber. -- By Hawthorne Hill WARFARE. -- The American "Regular." -- By the English correspondent of the London Times on board the United States transport "Gussie." --This text refers to the Kindle Edition edition.