Chapter I: Petroleum

BY JOHN D. NORTHROP[1]

[1] In this article, prepared in June, 1918, by Mr. Northrop, have
been incorporated certain notes and additions; as, for example,
information furnished by E. Russell Lloyd, of the United States
Geological Survey; A. G. White and W. E. Perdue, of the Bureau of
Mines, and others. (J. E. S.)