TEST FOR LIME SALTS.
Superficial tests that will indicate the condition of the water from the coloring produced by the impurities combining with chemicals that take them out of solution, can be made in the following manner: Five test tubes are half filled with water to be tested. The first one will be examined for lime in any form. A teaspoonful of aqua ammonia is put in the water for the purpose of stimulating the chemical action, then twenty drops of a solution of oxalate of ammonia are added. The degree of turbidity will indicate the quantity of lime in the water. Should the quantity of lime be very small, the test tube would have to be kept in a warm place a few hours before the re-action showed itself.