Slick-haired young Dr. Aristid von Grosse, research chemist of Chicago's Universal Oil Products Co., created a stir at a chemistry convention summer before last by exhibiting a speck, weighing one-tenth of a gram, of pure protoactinium which he had isolated. It was the first of the 92 elements to be isolated in the U. S. and this crumb constituted the world supply. Last week Dr. von Grosse created another stir by revealing that the world supply of protoactinium had unfortunately disappeared.
Heavier than any other element except uranium, protoactinium is radioactive. It is...
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