Feature

Two Elements Have Atomic Weights Changed

Cancer Cell Distinguished by Size of Nucleus

Front Matter

Fossil Horses in America: “A Classic of Science”

Nature Ramblings: A Pleistocene Rearguard

Phosphate Supply Assured for Next 500 Years

Alcohol-Gasoline Mixture Suggested as Motor Fuel

Adam and Eve in the Oldest City

Bone Cancer Successfully Treated with Arsenic

Lack of Vitamin $text{B}_{2}$, a Cause of Pernicious Anemia

Colonial America Revealed as Melting Pot by 1790 Census

Princeton Expedition Unearths Mosaic Floor