Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Michael Rogers Oldfield Thomas FRS 'With reference to your enquiry concerning the late Mr Lydekker, whose obituary notice ou kindly agreed to prepare, I beg to say that we have no particulars here that are not accessible in "Who's who" and such books of reference. From these I see that Mr Lydekker was born in 1649, and graduated at Trinity College, Cambridge, 1st Class, Nat. Sci. Tripos, 1971 and married a daughter of Canon O W Davys in 1882. He joined the staff of the Geological Survey of India in 1674. Perhaps these few data may be of use to you.' 30 April 1915