Feature

Thousands of Animals Used Sponge as House

Positive and Negative Electrons Apparently Produced in Pairs

New Discovery Shows How Films Hold Fast to Metals

Fungi, Thriving on Arsenic, Make Gases That Kill Men

Saw Replaces Explosives in Coal Mining

Nature Ramblings: Too-Dominant Parents

New Spectra Are Explored by German

Prediction of Tidal Wave Forestalls Harbor Damage

Front Matter

Live Mosquitoes Replaced by Glands in Paresis Treatment

Starlight to Help Open Century of Progress

Chloride Ink Test Promises Great Aid to Detectives