SCIENTIFIC AMERICAN SUPPLEMENT NO. 623

NEW YORK, DECEMBER 10, 1887

Scientific American Supplement. Vol. XXIV., No. 623.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

TABLE OF CONTENTS.

I.[ARCHITECTURE.—Notes on the Construction of a Distillery Chimney—A new method of building lofty shafts, including a metallic frame and brick lining—3 illustrations.]9949
[The Commercial Exchange, Paris—The new Paris exchange now in process of erection.—Present state of operations—1 illustration.]9954
II.[ASTRONOMY.—The Yale College Measurement of the Pleiades.— Dr. Elkin's work with the Repsold heliometer at Yale College.]9957
III.[CHEMISTRY—New Method for the Quantitative Determination of Starch.—By A.N. ASBOTH—Determination of starch by its barium compound.]9956
[Synthesis of the Alkaloids—A retrospect of the field of work so far traveled over by synthetical chemists, and future prospects.]9956
[The Chemical Basis of Plant Forms—By HELEN C. DE S. ABBOTT —Continuation of this important contribution to plant chemistry, one of the most valuable of recent chemical monographs.]9955
IV.[ELECTRICITY.—An Electrical Governor—A new apparatus for preserving a constant electromotive force with varying dynamo speed—1 illustration.]9952
[Electric Launch—A French government launch with Krebs electric motor.]9954
[The electric current as a means of increasing the tractive adhesion of railway motors and other rolling contacts.—By ELIAS E. RIES—A full review of this important subject, with accounts of its experimental examination.]9953
V.[ENGINEERING—Benier's Hot Air Engine—A new caloric engine very fully illustrated and described—8 illustrations.]9943
[Heating Marine Boilers with Liquid Fuel—A simple apparatus and recent experiments with the same.—3 illustrations.]9945
[The Change of Gauge of Southern Railroads in 1886—By C.H. HUDSON.—The conclusion of the account of this great engineering feat, with tables of statistics and data—16 illustrations.]9946
[Your Future Problems—By CHAS. E. EMERY—An address to the graduating class of the Stevens Institute, N.J.—A practical view of the engineering profession.]9943
VI.[MISCELLANEOUS—A Group of Hampshire Downs—A typical breed of sheep, their qualities and habits.—1 illustration.]9957
VII.[ NAVAL ENGINEERING—The Spanish Cruiser Reina Regente—A further description of this celebrated vessel—4 illustrations.]9948
[Torpedo Boats for Spain—The Azor and Halcon, two Yarrow torpedo boats, described and illustrated—7 illustrations.]9947
VIII.[ PHOTOGRAPHY—How Different Tones in Gelatino-chloride Prints may be Varied by Developers.—Twenty different formulæ for the above purpose.]9949
[Film Negatives—Eastman stripping films, their manipulation and development.]9949
IX.[SANITATION—French Disinfecting Apparatus—A portable apparatus for disinfecting clothes and similar objects—1 illustration.] 9952
X.[TECHNOLOGY.—The Manufacture of Cocaine—The extraction of cocaine with alkali and petroleum, with statement of percentage yielded by various leaves.]9954
[The Production of Oxygen by Brin's Process—The commercial manufacture of oxygen by means of baryta—3 illustrations.]9950
Transcriber's Note: Next entry not in original Table of Contents.
[Deep Sea Dredgings: Examination OfSea Bottoms. By THOMAS T.P. BRUCE WARREN.]9958