Odor, slight. Color, a little yellowish. Total solids, grains per gallon, 49.2 Soluble solids, 34.7 Ignition of residue, it blackens. Combustible and volatile matter, grains per gal., 9.24 Hardness, equivalent to grains of CaCo₃ per gal., 11.00 Alkalinity, ” ” ” ” 15.00 Chlorine, grains per gallon, 12.00 Ammonia, parts per million,— Free ammonia, 0.0666 Albuminoid ammonia, 0.3100 Nitric acid, grains per gallon, 2.69 Nitrous acid, none. Iodine, none. Bromine, none. Iron, very slight trace. Copper and lead, none. Microscopic examination of sediment shows,— Bacteria: Bacteria Bacillus. Bacteria Vibrio. Infusoria: Flagellata Monadina. Flagellata Euglenia. Ciliata Enchelia. Ciliata Bursarina. Ciliata Parmecia. Silicious granules. Small pieces of decaying wood. ADDITIONAL FACTS. Free carbonic acid, grains per gallon, 11.9504 Combined Co₂, ” ” ” 6.6528 Total Co₂, ” ” ” 18.6032 Bases: Lime, magnesia, soda, potassa, ammonia. Acids: Hydrochloric, sulphuric, nitric, phosphoric, carbonic, silicic. Most of the lime is in the form of carbonate held in solution by carbonic acid; most of the magnesia exists as a salt soluble in water, probably the sulphate; some of the alkalies are present as carbonates. The iron is kept in solution by carbonic acid. EXPLANATION AND OPINION.