Introduction: The solubility of solids in liquids. Compilations and critical evaluations of reported data for the solubility of the following in water: lithium phosphate, the Na2O-P2O5-H2O system, sodium dihydrogenphosphate, disodium hydrogenphosphate, trisodium phosphate, the K2O-P2O5-H2O system, potassium dihydrogenphosphate, dipotassium hydrogenphosphate, tripotassium phosphate, rubidium dihydrogenphosphate, cesium dihydrogenphosphate. System index. Registry number index. Author index.