Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [Messrs Harrison & Sons] 'Please prepare and forward to Messrs. Longmans, Green and Co., together with your account, electros of the following figures:- Proc. B. 80., fig.1. p.343; fig.20. p.361; fig.25. p.367; fig.28. p.373; Proc. B. 86., fig.2. p.193.' 16 May 1922