Feature

Nature Ramblings: Cromwell’s Two Skulls

Native Grasses Most Efficient in Holding Soil against Water

Turtle’s Tank-like Armor Not a Certain Defense

First Glances at New Books

Front Matter

Growth Stimulator Isolated; Found Similar to Vitamins

[Photograph]: Weed Tops Drink Death

Copper as Important in Food as Iron

Serious Petroleum Shortage Predicted in near Future

Fears of Petroleum Shortage Held Greatly Exaggerated

Butane, Propane Useful When Made into Liquids

[Photograph]: New Plane Is Queer-Looking, but Safe