1. Discourse delivered at the Royal Institution on Friday, May 25, 1928.
2. Proc. Roy. Soc., 114, 137 and 157; 1927; and 116, 516; 1927.
3. Proc. Roy. Soc., 114, 152; 1927.
4. Jour. Inst. Petroleum Tech., 13, 61; 1927.
5. J. Inst. Petroleum Tech., 13, 61, 224; 1927.