1. Singh and Bhaduri,J. Ind. Chem. Soc., 1930,7, 771; 1931,8, 181; Singh, Bhaduri and Barat,ibid. J. Ind. Chem. Soc., 1931,8, 345.
2. Temple,Trans. Faraday Soc., 1930,26, 272.
3. J.C.S., 1907,91, 1251.
4. Ibid. J.C.S., 1914,105, 764.
5. J.C.S., 1916,109, 757.