Letter from Douglas Rayner Hartree, regarding a paper 'The normal vibrations of bridge X2 Y6 molecules' by Ronald Percy Bell and Hugh Christopher Longuet-Higgins Sectional Committee: Chemistry Apologises for his previous response to the communicaotr and authors has miscarried. Does not remember fully what he wrote, but his first point was met by the additions of the communicator. His other points were justified by the response of the communicator. Is now satisfied that the paper can be published. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on recto as received 16 May 1944. 13 May 1944