EFFLORESCENCE

the property which certain hydrated salts have of losing water when exposed to air. Thus washing-soda, Na.CO;, 10H O, if left in air becomes opaque, loses its crystalline appearance, and finally falls to a powder by lo of water. The term is also applied in botany to the proce of flowering. _ EFFLUENTS, a general term applying to liquids, on being discharged, after undergoing some form of treatment. The term is more particularly applied to the purified liquid discharged into rivers and streams from sewage works, the crude sewage having been freed of the xsvuswser solids, and ren 74 EFFODIENTIA dered clear and innocuous to animal and vegetable life.