Letter from Philip Ivor Dee, on a paper 'The nuclear ß-spectra of thorium B - C and C - C', and the intensities of some ß-ray lines of thorium (B+C+C")' by D G E Martin and H O W Richardson to D C Martin, Assistant Secretary of the Royal Society The paper has been thoroughly revised and shortened. Apologises for the delay but he has been 'overwhelmed with the student activities which accompany the end of the academic year'. [Published in Proceedings of the Royal Society A, 1948]. Endorsed on recto as received 23 June 1948. 22 June 1948