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ITHAS BEEN quite clearly realized for some time that the dominating influence in corrosion difficulties in natural waters is the content of dissolved oxygen.This was first experimentally demonstrated by Wal-ker2 and his co-workers, and followed up a few years later by some work by one of the authors in which the loss of weight of weighed test pieces at various oxygen concentrations was determined.8 This term was adopted to denote a tank carrying a large surface of metal serving to fix the free oxygen in water.

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in which air conditioning is involved were developed by pioneer chemists. In one industry at least, the rayon industry, air conditioning is absolutely necessary for continuous production.As it is the writer's opinion that the hydrogen-ion concentration of all colloidal materials, a function of the electrical equilibrium of the material, can be balanced against the hydrogen-ion concentration or the electrical equilibrium of the surrounding air, he believes that the future field for research is one for the chemist, the air-conditioning engineer, and the physicist or the electrophysicist, working in conjunction with each other, to develop a complete analytical method of determining proper conditions for industries as well as general comfort.