Copy letter from Herbert Rix, to Sir Henry Roscoe, Fellow of the Royal Society 'Dear Sir Henry, I will advertise the title of your paper and will see that the lantern is ready for your wants on Thursday. Please let me have the MS. [manuscript] at the earliest possible moment. It ought to be in our hands by Monday to make sure of getting it into type in time, though we will, of course, do our best whenever it arrives. I am, yours truly, Herbert Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 18 April 1891