In the issue of Science for October 17, 1924, there is an article under the above title calling attention to very interesting experimental results obtained by S. C. Lind and D. C. Bardwell, of the U. S. Bureau of Mines. Attention has been called to the occurrence of vanadium and nickel in petroleum by DeGolyer on page 550, Volume 19, of Economic Geology, and by Ramsey’s paper abstracted by Hess in this Bulletin. Wells has also submitted additional observations on the minor constituents of petroleum for publication in Economic Geology.

The experiment described by Lind and Bardwell...

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