Produced by Don Kretz, Juliet Sutherland, Charles Franks and the Distributed Proofreaders Team [Illustration] SCIENTIFIC AMERICAN SUPPLEMENT NO. 384 NEW YORK, MAY 12, 1883 Scientific American Supplement. Vol. XV., No. 384. Scientific American established 1845 Scientific American Supplement, $5 a year. Scientific American and Supplement, $7 a year. * * * * * TABLE OF CONTENTS. I. ENGINEERING.--Locomotive for St. Gothard Railway.--Several figures. The Mersey Railway Tunnel. Dam Across the Ottawa River, and New Canal at Carillon, Quebec. Several figures and map. II. ARCHITECTURE.--Dwelling Houses.--Hints on building. By WILLIAM HENNAN.--Considerations necessary in order to have­ thoroughly sweet homes.--Experiment illustrating the necessity of damp courses.--How to make dry walls and roofs.--Methods of heating.--Artificial lighting.--Refuse.--Cesspools.--Drainage House at Heaton.--Illustration. A Mansard Roof Dwelling. 2 figures. III. ELECTRICITY.--The History of the Electric Telegraph.--Documents relating to the magnetic telegraph.--Apparatus of Comus and Alexandre.--Origin of the electric telegraph.--Apparatus of Lesage, Lemond, Reveroni, Saint Cyr, and others.--Several figures. Electrical Transmission and Storage.--By DR. C. WM. SIEMENS. III. MEDICINE AND HYGIENE.--Malaria. By Dr. JAMES SALISBURY.--VII. Report on the cause of ague.--Studies of ague plants in their natural and unnatural habitats.--List of objects found in the Croton water.--Synopsis of the families of ague plants.-- Several figures. Ichthyol. Autopsy Table. 1 figure. The Exciting Properties of Oats. Filaria Disease. IV. CHEMISTRY.--Preparation of Hydrogen Sulphide from Coal Gas. By J. TAYLOR. 1 figure. Setting of Gypsum. V. TECHNOLOGY.--On the Preparation of Gelatine Plates. By E. HOWARD FARMER. Pictures on Glass. VI. NATURAL HISTORY.--Survey of the Black Canon. The Ancient Mississippi and its Tributaries. By J. W. SPENCER. VII. AGRICULTURE.--The Spectral Masdevallia.--Illustration. * * * * * LOCOMOTIVE FOR ST. GOTHARD RAILWAY.