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The Project Gutenberg EBook of Scientific American Supplement, No. 787, January 31, 1891, by Various This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.net Title: Scientific American Supplement, No. 787, January 31, 1891 Author: Various Release Date: November 10, 2004 [EBook #14009] Language: English Character set encoding: ASCII *** START OF THIS PROJECT GUTENBERG EBOOK SCIENTIFIC AMERICAN *** Produced by Victoria Woosley, Don Kretz, Juliet Sutherland, Charles Franks and the PG Distributed Proofreading Team [Illustration] SCIENTIFIC AMERICAN SUPPLEMENT NO. 787 NEW YORK, January 31, 1891 Scientific American Supplement. Vol. XXXI., No. 787. Scientific American established 1845 Scientific American Supplement, $5 a year. Scientific American and Supplement, $7 a year. * * * * * TABLE OF CONTENTS. I. BIOGRAPHY.--CHARLES GOODYEAR.--The life and discoveries of the inventor of vulcanized India rubber, with portrait.--1 illustration II. BIOLOGY.--Can we Separate Animals from Plants?--By ANDREW WILSON.--A debated point well discussed.--The bases on which distinctions must be drawn III. ELECTRICITY.--A New Electric Ballistic Target.--A target for investigations of the velocity of projectiles, now in use at the United States Military Academy, West Point, N.Y.--1 illustration. Electric Erygmascope.--An electric lighting apparatus for examining earth strata in bore holes for geologists' and prospectors' use.--1 illustration The Electro-Magnet.--By Prof. SILVANUS THOMPSON.--Continuation of this exhaustive treatise, giving further details on special points of construction.--1 illustrations IV. ENTOMOLOGY.--Potash Salts.--The use of potash salts as insecticides, with accounts of experiments The Outlook for Applied Entomology.--By Dr. C.V. RILEY, U.S. entomologist.--The conclusion of Prof. Riley's lecture, treating of the branch of entomology with which his name is so honorably associated V. INSURANCE.--The Expense Margin in Life Insurance.--Elaborate review of the necessary expenses of conducting the
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