SONIC STUDIES OP LIQUIDS. I 759The rate of vaporization and condensation is affected to a remarkable degree by the state of dryness. Ammonium chloride which has been dried for ten days at 60°in a high vacuum appears to be completely dissociated in the vapor state. Urbana, Illinois

SONIC STUDIES OF LIQUIDS 13131. The flames of rich mixtures of Pittsburgh natural gas, CH4 and CsH6, are extinguished when the upstream electrode is negatively charged; the flames of lean mixtures of these gases cannot be extinguished with this direction of the field.2. The flames of lean mixtures of C3H8, C4Hi0, iso-C4Hio, C3H6 and C4H8 are extinguished when the upstream electrode is negatively charged; the flames of rich mixtures of these gases cannot be extinguished with this direction of the field.3. The flames of rich or lean mixtures of all the above hydrocarbon gases and in addition lean mixtures of C2H2 and CO are extinguished when the downstream electrode is negatively charged.4. Certain effects with a tranverse field are cleared up. A brief discussion of the results is given. It is concluded that the positive ion plays an important role in the maintenance of flames.