Copy letter from Herbert Rix, to Professor Walter Frank Raphael Weldon, Fellow of the Royal Society 'Dear Professor Weldon, Dr Michael Foster instructs me to write and ask you whether you could do us the favour next Wednesday of attending the press view at 4.30, in order to explain the biological exhibits to the members of the Press who are to write the accounts of our Soirée. Professor Ayrton undertakes to explain the electrical and physical exhibits, if you will do the biological. Yours truly, Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society] I will send you advance copy of programme'. 12 June 1891