The Penetrating Power of "N₁-Rays."

Four Leading Foreign Exhibits at the World's Fair

The Automobile Tour to the World's Fair

The Position of the Range Finder on a Warship

Renard's New Boiler for Airships

The National Geographic Congress

A New Cunarder

The Mercury Vapor Lamp for Photographic Work

The United States Marine Corps

The Utilization of Snake Venom in Preparing Anti-Bubonic Serum

The Mount Pilatus Railway, Switzerland

Strange Sights in the Far North

Speed Trial of the Battleship "Ohio."

Cabinet for Storing Phonograph Records

Medical Battery

A Marvelous Automobile Record--1031/2Miles an Hour

The Oldest Known Inhabitant of the Globe

By the St. Louis Correspondent of the Scientific American

Business and Personal Wants