WATER 268
Importance; Impurities in Water; Mineral Impurities;
Organic Impurities; Interpretation of a Water Analysis;
Natural Purification of Water; Water in Relation to
Health; Improvement of Waters; Boiling of Water; Filtration;
Purification of Water by Addition of Chemicals;
Ice; Rain Waters; Waters of High and Low Purity;
Chemical Changes which Organic Matter of Water Undergoes;
Bacterial Content of Water; Mineral Waters;
Materials for Softening Water; Uses of; Economic Value
of a Pure Water Supply.