1. Bhatnagar and co-workersCurr. Sci., 1935,4, 153, 234;Jour. Chem. Soc., 1935,12, 799; 1936,13, 173.
2. FarquharsonPhil. Mag., 1932,14, 1003.
3. Gray and CruickshankTrans. Farad. Soc., 1935,32, 1491.
4. Clow —Ibid.,, 1937,33, 381.
5. Bhatnagar and BahlCurr. Sci., 1935,4, 153, 234.