Copy letter from Robert William Frederick Harrison, to Sir Norman Lockyer, Fellow of the Royal Society Referring to Lockyer's letter to Professor [Arthur William] Rucker on the 12 November, they have been looking up the De la Rue sun-spot manuscript, but are not sure that they have traced the particular one Lockyer desires. As there is a large bulk of them it would perhaps be best if Lockyer sent an assistant to go through them with Mr White. 20 November 1900