Fineness of division of lime (Fippin).

The finer the lime (the smaller the particles) the greater its availability. Considering the calcium content, first cost, freight, and fineness, it is often better to use the lump or hydrated or ground lime than the ground limestone or marl; the lump quicklime slakes into very fine particles when applied to the soil. It is impossible to attain the same degree of fineness by grinding that is attained by burning and slaking. Seventy-five per cent, at least, of the ground material should pass a 100-mesh screen. The larger the percentage of coarse material, the larger the amount necessary to get the same net effect. Considering composition and fineness as commonly found on the market, 50 lb. of lump lime is equivalent approximately to

60 lb. hydrated lime. 100 lb. air-slaked lime. 250 lb. ground limestone or marl.

Classification of lime for agricultural purposes.

Agreement between the Directors of the New England and New Jersey Experiment Stations and the Special Committee of the National Lime Manufacturers' Association of Boston, March 3, 1909.

Agricultural Lime 68

All shipments except Kiln Slaked shall be accompanied by a statement showing (1) proper class name and (2) guaranteed analysis, in which the respective percentages of calcium and magnesium oxides are given.

Package shipments to show class and analysis on each package.

Bulk shipments to have class and analysis statement attached either to invoice or inner side of the car.

All lime to be sold by weight cwt. or ton.

Analyses to be those at kiln, and guaranteed.