•This point was established as early as 1865 liy Wolf, Landw. Versuchstt., 7 i^p. 20, 211 (18G5).

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THE solubilities, so-called, of the slightly soluble phosphates have been frequently determined. The recorded data are, however, very c0nflictir.g and have little more than historical interest. The phosphates of iron, aluminum, and calcium are all substances which react with water, or are hydrolyzed, yielding, as m e of the products of the reaction, phosphoric acid, which is much more soluble than the phosphate itself, and, at the same time, the hydroxide of the metal or possibly a basic phasphate, generally less soluble than the original phosphate. The solutions always contain free acid. It is not strictly correct, therefore, to speak of the solution, resulting from the action of water upon one of these phosphates, as a solution of the phosphate; rather it is a solution of the decomposition Droducts, and the phosphate itself is, in many cases, present in negligible quantities d y .* The acidity of the solutions, however, increased.