Copy letter from Robert William Frederick Harrison, to Edgar Johnson Allen, [Fellow of the Royal Society], The Laboratory, Citadel Hill, Plymouth 'In answer to your letter of the 13th inst., I know of no engagements here on June 22nd and June 24th likely to interfere with your suggested arrangements. The usual rooms will, therefore, be at your disposal. I am, Yours faithfully, Robt Harrison ASst. Sec. R.S. [Assistant Secretary, Royal Society]'. 15 June 1896