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While they may improve conditions somewhat, the only solution to such a problem is the use of the boneblack process.

Animal charcoal or boneblack.—This material is made from bones of animals, by burning them in a kiln built for that purpose.

The following is commended for the preparation of a black ink or paste for use with stencils:—Boneblack, 1 lb.; molasses, 8 ozs.; sulphuric acid, 4 ozs.; dextrine, 2 ozs.; water sufficient.

Muriate of potash costs $40 and upwards per ton, sulfate about $48, dissolved boneblack about $24, ground bone about $30, kainit about $13, and nitrate of soda about 2-1/4 cents per pound.