Feature

New X-Ray Method Reveals Sex before Birth of Baby

Governor of Porto Rico Seeks Aid of Ancient Art

Eight Indian Types Found in Cemetery Used 1,000 Years

Hydrogenation to Bring Better Oils and Gasoline

Nature Ramblings: House Centipede

Recent Rock Fall a Trifling Incident in Niagara’s History

Explains How “Spirits” Shake Tent in Indian Ceremony

Zinc, Cadmium and Mercury: “A Classic of Science”

[Photograph]: Padding an Airplane Cabin

New Cable Sends 2500 Letters a Minute

February a “Perfect” Month of the Simplified Calendar

Ice Meets Its Match