Letter from [Isaac] Lowthian Bell, Rounton Grange, Northallerton, to the Royal Society 'Dear Sir, As a member of the Board of Directors of the North Eastern Railway I have compiled Reports on the Wear of Rails on their system. To this information particulars are added giving the composition of many specimens with molecular change produced by use. Should the subject interest the Royal Society I will direct a copy to be forwarded. Yours faithfully, Lowthian Bell'. Includes manuscript annotation which remarks on the Royal Society's interest in obtaining a copy of the report. April 1904