101 Frank A.J.L. James , Christmas at the Royal Institution: An Anthology of Lectures by M. Faraday, J. Tyndall, R. S. Ball, S. P. Thompson E.R. Lankester, W. H. Bragg, W. L. Bragg, R.L. Gregory, and I. Stewart (Singapore, 2007), pp. 17–33, published Lecture VI.