No CrossRef data available.
Published online by Cambridge University Press: 22 March 2019
page 50 note * In the earlier paper λ was called n; its value was less than the value of λ in the present paper.
page 51 note * See Tait, Trans. Roy. Soc. Edin., vol. xxvii. pp. 125-140; also Scientific Papers, vol. i. pp. 218–233.