Derelict Mines--A Peace Peril, The Hudson River Tunnel and more

The Submarine Situation

The Submarine with 12-inch Gun a Fact--and Some Other Facts

Influenza—The Sphinx of Diseases

When we speak of the cause of a disease, we are guilty of an error. Any given disease has many causes

Industrial Cooperation as a Factor in Reconstruction

Airplanes for the Transatlantic Flight

What Aircraft Constructors Are Doing Toward Making the Great Flight Possible

Cost of the New Three-Year Naval Program

Moving Up from Millions to Billions in Naval Estimates

Speeding Up the Drier

How an Operation Once Left to Sun and Wind Has Been Brought Within the Mechanical Field

The Current Supplement