ago, 1919.)

CHAPTER II

The reader who may be interested in following up this subject will find
references to all the literature in the summary by Helen R. Hosmer, of
the Research Laboratory of the General Electric Company, in the _Journal
of Industrial and Engineering Chemistry_, New York, for April, 1917.
Bucher's paper may be found in the same journal for March, and the issue
for September contains a full report of the action of U.S. Government
and a comparison of the various processes. Send fifteen cents to the
U.S. Department of Commerce (or to the nearest custom house) for
Bulletin No. 52, Special Agents Series on "Utilization of Atmospheric
Nitrogen" by T.H. Norton. The Smithsonian Institution of Washington has
issued a pamphlet on "Sources of Nitrogen Compounds in the United
States." In the 1913 report of the Smithsonian Institution there are two
fine articles on this subject: "The Manufacture of Nitrates from the
Atmosphere" and "The Distribution of Mankind," which discusses Sir
William Crookes' prediction of the exhaustion of wheat land. The D. Van
Nostrand Co., New York, publishes a monograph on "Fixation of
Atmospheric Nitrogen" by J. Knox, also "TNT and Other Nitrotoluenes" by
G.C. Smith. The American Cyanamid Company, New York, gives out some
attractive literature on their process.

"American Munitions 1917-1918," the report of Benedict Crowell, Director
of Munitions, to the Secretary of War, gives a fully illustrated
account of the manufacture of arms, explosives and toxic gases. Our war
experience in the "Oxidation of Ammonia" is told by C.L. Parsons in
_Journal of Industrial and Engineering Chemistry_, June, 1919, and
various other articles on the government munition work appeared in the
same journal in the first half of 1919. "The Muscle Shoals Nitrate
Plant" in _Chemical and Metallurgical Engineering_, January, 1919.

CHAPTER III

The Department of Agriculture or your congressman will send you
literature on the production and use of fertilizers. From your state
agricultural experiment station you can procure information as to local
needs and products. Consult the articles on potash salts and phosphate
rock in the latest volume of "Mineral Resources of the United States,"
Part II Non-Metals (published free by the U.S. Geological Survey). Also
consult the latest Yearbook of the Department of Agriculture. For
self-instruction, problems and experiments get "Extension Course in
Soils," Bulletin