double reason. It is salable by itself and it is detrimental to plant
life.

Another mineral source of potash is alunite, which is a sort of natural
alum, or double sulfate of potassium and aluminum, with about ten per
cent. of potash. It contains a lot of extra alumina, but after roasting
in a kiln the potassium sulfate can be leached out. The alunite beds
near Marysville, Utah, were worked for all they were worth during the
war, but the process does not give potash cheap enough for our needs in
ordinary times.

[Illustration: Photo by International Film Service

IN ORDER TO SECURE A NEW SUPPLY OF POTASH SALTS

The United States Government set up an experimental plant at Sutherland,
California, for the utilization of kelp. The harvester cuts 40 tons of
kelp at a load]

[Illustration: THE KELP HARVESTER GATHERING THE SEAWEED FROM THE
PACIFIC OCEAN]

[Illustration: Courtesy of Hercules Powder Co.

OVERHEAD SUCTION AT THE SAN DIEGO WHARF PUMPING KELP FROM THE BARGE TO
THE DIGESTION TANKS]

The tourist going through Wyoming on the Union Pacific will have to the
north of him what is marked on the map as the "Leucite Hills." If he
looks up the word in the Unabridged that he carries in his satchel he