Copy letter from Herbert Rix, to Dr Pierre Paul Émile Roux, Institut Pasteur, Paris 'Dear Sir, We sent you some time since the proof of your Croonian Lecture to be corrected and sent back here. Will you let us have it back as soon as you can? as our publication work halts for want of it. I am, yours faithfully, Herbert Rix Asst. Sec. RS [Assistant Secretary, Royal Society]'. 17 July 1889