Prodigal Mother Nature

By Cross-breeding and Persistent Selection the Plant Breeder Speeds Up Nature's Slow, Wasteful Hit-or-miss Methods of Producing New Species a Thousand-fold

How to Observe the Great, New Sun Spots

And We Call Ourselves Efficient

The Internal Heat of the Earth

The Center of the Earth--What We Know of Its Temperature, Structure and Its Composition

The Great Crimson Aurora of March 9, as Seen Over the City of London

Mileage Goes Up in Smoke

Uncle Sam, Spendthrift--II

Shall the "Wildcatter" Wreck Our Oil Resources as the Lumberman Has Wrecked Our Forests?

Houses Built in Twenty-four Hours!

The Hydrostatic System of Trees

The Force that Draws Tons of Sap to the Topmost Branches of Trees Is the Evaporation of Water from the Leaves

The Applied Science of Public Spending

Through an Effective Budget System Our Government Is Saving Millions This Year

Budding Scientists

A Nation-wide Organization Is Training Our Future Leaders in Research Work

Odd Pieces of Change

A Weird Miscellany of Queer-shaped Coins Have Been the Forerunners of the Round Flat Money of Today

X Rays and Atoms

By Means of Crystals or Powders the X Rays Are Diffracted or Reflected in Definite Patterns. These Enable the Analyst to Deduce the Arrangement of the Atoms Within the Crystals

Eavesdropping on the Arctic

Radio Fans Will Comb the Ether for Messages from the Aviator-explorers Racing to the Pole

The Manufacture of a Battleship's Turret Guns

From the Molten Steel in the Furnace to the Finished Gun on the Ship

Annapolis

The Famous College Where Our Future Admirals Receive Their First Training

Oil Engine in a New Field

Performance of Powerful Diesel-Electric Dredge, Port of Portland

Something New in Gas Holders

Details of a Waterless, Non-telescopic Gas Holder at Michigan City, Indiana