Offprint from 'The Scientific Proceedings of the Royal Dublin Society' entitled ‘An Investigation into the Causes of the Self-Ignition of Ether-Air Mixtures’ by The Late Prof. J.A. McClelland, D.Sc., F.R.S., and Rev. H.V. Gill, S.J., D.S.O., M.C., M.A.. (Vol. XVI (N.S.), No. 10, p.109 – 119)