Feature

Individual Loudspeakers Quiet “Drive-in” Theaters

Experiments Show Nature of Chemical Action of Enzymes

Front Matter

“Handies” Turn Limelight on Man’s Oldest Language

Highest Heat Death Rates in Arizona and Nevada

Ball Lightning Observed by Nebraska Family

Flower Photo a “Fooler” to Trap Unwary Botanists

Do Not Expect National Infantile Paralysis Outbreak

[Photograph]: World’s Largest

Nasal Spray as Preventive of Infantile Paralysis

Short Syphilis Treatment Has Been Successful

In Tennessee Valley Also Drought Did Great Damage