Feature

Tidal Motor Made by Bulgarian

Gases Dense as Metals in Stars

New Sounding Method Improved by Coast Survey

Doctors Doubtful of Cancer Serum

A Table Trick and What It Teaches

Organization to Study Tropic Plants

Educated Snail Learns to Speed

Medical Association President Criticizes Modern Coddling of Weak

British Scientists to Meet in Toronto

Aviettes

Convention Photos Sent by Wire

Simple Science by Wow: Butter