Copy letter from Herbert Rix, to Dr David Ferrier, Fellow of the Royal Society 'Dear Dr Ferrier, I put your note before the Officers and obtained permission to go on with the paper at once, leaving the question who is to pay for the ten figures to be decided by the next Council. I am, yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 7 June 1894