Copy letter from Herbert Rix, to John Ball, Fellow of the Royal Society Rix cannot be certain as to who the executors of Dr Warren de la Rue's estate are, but has been told Ernest de la Rue is one of them. Dr Hugo Muller is likely to know with greater certainty. Rix will return to work on 15 September, and so if Ball leaves the letters for them to post, they will ensure they are despatched on 20 October. 27 June 1889