Collier's New Encyclopedia

A complete general encyclopedia of 1921 — the world as it was understood just after the Great War, from Aachen to Zwingli, across twelve volumes and six thousand pages.

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Superphosphate of Lime

P2O2 (HO) CaO2; a compound of phosphoric acid and lime in which only one-third of SUPERSTITION lime. Technically, it is used to describe an important kind of manure, made by treating ground bones with from onethird to two-thirds of their equivalent of sulphuric acid, whereby acid phosphate of lime is formed, together with a quantity of sulphate of lime corresponding to the sulphuric acid used. By substituting coprolites for bones, a manure of nearly identical composition is obtained.

This kind of manure is of the highest value, from its stimulating effects.

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