Letter from James Dewar, Cambridge, to [Joseph] Larmor Discussing [Morris William] Travers' paper read at the Royal Society. Travers referred to Dewar's address of 1902 for the description of solid hydrogen, but this was only a repetition of what Dewar had said in the original paper of 1899, published in 'Nature', and the work was continued in other publications. The Royal Society had three papers by [Allan] Macfadyan on the subject, while cooling and heating up was described by [Harold] Swinthinbank in 1901. He thinks it an objectionable practice of covering ground. 20 February 1904