Feature

Governor of Porto Rico Seeks Aid of Ancient Art

Ice Meets Its Match

Front Matter

Recent Rock Fall a Trifling Incident in Niagara’s History

Lack of Iron May Cause Common Mental Disease

Hydrogenation to Bring Better Oils and Gasoline

Robber-Fly Masquerades in Bumble-Bee’s Clothing

Effects of Liver Extract on Plants and Man

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

New X-Ray Method Reveals Sex before Birth of Baby

Nature Ramblings: House Centipede

Eight Indian Types Found in Cemetery Used 1,000 Years