The President's Great Opportunity, Tremendous, The State's Duty to Its Barge Canal
Electricity, Science, Astronomy
Putting Green Sand to Work
How the Hitherto Untouched Glauconite Deposits Will Insure Our Future Potash Requirements
Our Latest Battleship, the "Maryland"
Something New in Salvaging Equipment
How Much Air for the Tunnel?
Solving the Vehicular Tunnel Ventilation Problem with the University of Illinois' Miniature Test Duct
Drying Wood in the Orient, Helping the Automobile Out of Sand with Chicken Wire and more
The Oil that Makes the Wheels Go 'Round
Animal and Vegetable Lubricants vs. Those of Mineral Origin Today and in the Future
The Summer Sneezer
New Light on Hay Fever, Rose Colds, and the Like
Clusters and Nebulae
Some Startling Facts and Figures Concerning These Interesting Astronomical Features
Man-Made Precious Stones
Efforts of the Past and Present To Produce Synthetic Rubies, Sapphires, and Even Diamonds
The Motor-Driven Commercial Vehicle
Recently Patented Inventions
New Books, Etc.