Letter from J D Griffith Davies, Assistant Secretary of the Royal Society on a paper 'Photochemical laws and visual phenomena' by B H Crawford to Thomas Smith The paper has been passed for printing, but not publication because of its confidential nature. Asks which government departments or persons should be asked if they want a copy. He presumes the Admiralty, Air Ministry and Ministry of Home Security should be contacted. He requires the original drawings of the figures for the engraver and asks if Smith can ask the author to send them. [Published in Proceedings of the Royal Society B, 1946]. 14 August 1940