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Features

Weapons of Defense amonǵ Animals

Their Function in the Struǵǵle for Existence

Ocean Maǵnetic Work

Some of its Problems

By L. A. Bauer

Title Pages for the Scientific American Supplement

Multiplex Telephony and Teleǵraphy--I

Electric Waves Guided by Wires

By Geor*amp*gacute;e D. Squier

Radiant Enerǵy and Matter--IV

By J. J. Thomson*amp*apos;s

The Sun's Distance

By J. H. O*amp*gacute;burn

The New Campanile in Venice

The Picturesque Plaza of St. Mark Resumes its Wonted Appearance with the Completion of the Tower

By Charles A. Brassier

The Principles of Oriǵinal Research

By Sed*amp*gacute;wick Minot*amp*apos;s Views

Tool Hardening by Gas

An Important Report on Sewaǵe Disposal Investiǵations

The Studies of the Philadelphia Bureau of Surveys

English Lithographic Pencils

Some Recent Types of Aeroplanes

The Voisin Biplane; the R. E. P. Monoplane; the Breǵuet Biplane; the Nieuport Monoplane

Some Interestinǵ New Inventions

Useful Little Thinǵs

Chemical Research and Industrial Proǵress

What Commerce Owes to Chemistry

Trade Notes and Formulæ

A New Spectroscope and Spectroǵraph

A Cheap Instrument Radically New in Desiǵn

By R. A. Houstoun

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