Scientific American Magazine

May—Aviation Number

Many Unique Features and Engineering Problems Involved in Building the World's Tallest Structure

A Physician's Practical Plan to Rid the World of the Mosquito-Borne Disease; a Plan Which Nearly All Can Test

Work Is Progressing on This 700 Mile Highway, in Which All Grade Crossings Are Eliminated

Astronomers Will Make Full Preparation, Even Though the Coming Solar Eclipse Will Last Only Two Seconds

Natural Humus Is Pumped, in Suspension, From Lake Bed Onto Gravelly Soil, Resulting in Extraordinary Fertilization

X-ray Studies of Peruvian Mummies Show Us the Injuries and Diseases From Which the Ancient Civilized Indians Suffered

A Bridge of Unusual Design, Built by Unusual Methods, Is Nearing Completion Over the Elorn at Brest, France

In the Highly Organized New York Police College Every Branch of Law Enforcement Is Dealt With in Detail

When Its Hard Day's Work Is Finished, the "Iron Horse" Retires for a Bath and Complete Inspection

Whether on Your First Flight or on a Long Air Journey, You Can Make Snapshots With an Ordinary Camera

Open-Pit Mining Operations at Colstrip, Montana, Using New Operating Equipment of Unsurpassed Size and Efficiency

Steel-Sheathed Film Reduces Replacement Costs; Has Great Educational Value

Has a New Era of Artificial Lighting Arrived? Illumination That Approximates Sunlight Is Foreshadowed

Doing Away With the Disease Called "Museum Fatigue" by Skillful Planning and Lighting

There Is No Recipe for Longevity, Which Is Mainly Hereditary. However, a Milk Diet Seems to Favor Long Life