The Mentor: The Story of Coal, vol. 6, Num. 6, Serial No. 154, May 1, 1918

LEARN ONE THING EVERY DAY
MAY 1 1918
SERIAL NO. 154
THE MENTOR THE STORY OF COAL
By CHARLES FITZHUGH TALMAN
Editorial Writer for the Scientific American
DEPARTMENT OF SCIENCE
VOLUME 6 NUMBER 6
TWENTY CENTS A COPY
By BERTON BRALEY
Grimy, and caked with dust of coal he stands,
Grasping his pick within his mighty hands;