Called Water Chemistry at www.japanese-home-gardens.com

Much of what is called water chemistry is the chemistry of substances suspended or dissolved in water. Water analysis involves the determination of these substances and materials. Except for seawater and occasional brine wells, most surface and underground waters are relatively low in dissolved substances. The amounts of dissolved and suspended matter in water are generally measured in terms of parts per million parts of water, or ppm. What are known as mineral waters, which are popularly thought to have medicinal value, rarely ever have more than 5,000 ppm. dissolved matter. Most public water supplies do not exceed 300 ppm. Suspended matter, except for river water in flood stage, is rarely higher than 1,000 ppm., and is often quite low.

The latter figure is important when con densing steam is employed in domestic and industrial heating systems. Chemistry.—Since the physical properties oi water are dependent upon its chemical structun and composition, some of these properties wil be covered in the following discussion of the chemistry of water. The ancient philosophers included water among the four elements, the other three being earth, air, and fire. The term "element" had a much different meaning at that time, and water represented the properties of cold and fluidity.

ROSE, Heinrich, German chemist: b. Berlin, 6 Aug. 1795; d. there, 27 Jan. 1864. He first devoted himself to pharmacy, studied in Berlin, in Stockholm in 1819 under Berzelius, and from there went to Kiel, where he took his degree. In 1823 he became extraordinary and in 1835 ordinary professor of chemistry at Berlin. As a practical analyst in the department of inorganic chemistry he held a high rank, and the result of his labors can be found in his memoirs inserted in the 'Annalen'.of Poggendorff. His 'Manual of Analytical Chemistry* (1829) was translated into French, English and Swedish. In 1844 he discovered a new metal in the fan-tallies of Bavaria which he called niobium.