Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to John Hamer Esquire; 158 Darwen Road, Bromley Cross, Bolton Reply to an earlier letter from John Hamer Esquire. Explains that if Mr. Hamer has already attested then the enclosed letter of instructions will apply to his case [not enclosed]. If Mr. Hamer has not attested then he must obtain a certificate of recommendation for exemption from the Society, for which the Society will need to see a full statement of his chemical qualifications. 8 March 1916