A lengthy and detailed biography of the American scientist and educator chiefly known for his process of dust precipitation that is of great value in gold and silver refineries. A native of Oakland, California, Cottrell entered the University of California at 16, later continued his education in the still largely uncharted field of physical chemistry in Germany. In the early part of the century, Cottrell returned to teach at Berkeley, became interested in the problem of electrically dispelling smelter smoke, and gave the California oil industry a new lease on life by the discovery of a process which reduced the water content in pumped oil. Later as his renown in the field of research spread, Cottrell pushed for international cooperation in the fields of pure and applied science, attended many Geneva conferences and became deeply interested in the various post-World War I proposals for an international language. Though well past middle life when the penetration of atoms became practical reality, Cottrell aided younger scientists at Berkeley through his Research Corporation and continue to receive rewards and recognition for his work to the day of his death in 1948. Of greater appeal in industrial and scientific fields than the straight biographical.