Published online by Cambridge University Press: 20 January 2009
The following paper is a continuation of one read before the Society some years ago, and published in the Proceedings, Vol. XXXIV. (Part 2), Session 1915–1916. The results of that paper, more especially those summarised in Art. 14, and those of Arts. 17, 18 will be assumed.
* References to the 1916 paper will be given in this form.