AFTER reading Arrhenius's vivid account 1 of the bombardment of the earth by electrically charged solar dust, one is prepared to appreciate Prof. Joly's hypothesis as set forth in his letter in ...

The latest portion of this survey will provide images that expand the fundamental knowledge of geology and hydrology underpinning northwest and southeast Louisiana, central and southwest Mississippi, ...

IN considering the influence of radium on earth history, it appears to be generally assumed that the radium detected everywhere in the surface materials of the earth is an original constituent of ...