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Article
How old is the Cambrian System?
PROF. C. F. DAVIDSON has presented no new evidence free from unambiguous interpretation which would refute our proposed extension of the Holmes B time-scale; or indeed on which an alternative scale could be based...
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Article
Production by Cosmic Rays of Helium-3 in Meteorites
THE helium content of iron meteorites varies from less than 10−9 c.c. to 4 × 10−5 c.c. per gm.1. Since their uranium and thorium content is fairly constant, this variation was considered as an indication of their...