Copy letter from Herbert Rix, to Killingworth Hedges, W. 'Dear Sir, Your kind offer to exhibit on May 6th is accepted by the Soirée Committee. Will you please fill in the enclosed form and return here as early as you can. Yrs [Yours] faithfully, Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 20 April 1891