Copy letter from Herbert Rix, to Professor Michael Foster, Secretary, Royal Society 'Dear Sir, Mr Carruthers writes to ask if Mr J G Grenfell may exhibit "gelatinous trails left by moving diatoms". He admits that Mr Grenfell has not yet arrived at definite conclusions, so there is the less difficulty in declining the exhibit. I have written to Mr Carruthers to tell him that every available inch is already appropriated, and that I propose to submit the matter to the Soiree Committee for the June Soiree. I should say that the letter is addressed to yourself, hence this note. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 28 April 1894