Letter from Charles E S [Edmund Stanley] Phillips, Castle House, Shooter's Hill, Kent, to [Joseph] Larmor Thanking Larmor for his interesting letter, which he will follow up when he has time. It is well known that different metals emit cathode rays differently, but the part played by other substances adhering to the electrode surface is peculiar and has not been systematically researched, which he hopes to do. 26 April 1909