Copy letter from Robert William Frederick Harrison to Professor [David] Ferrier, Fellow of the Royal Society, Chairman of the Sectional Committee for Physiology 'Paper by Dr A Gray on Cell-Selection in the causation of permanent immunity acquired in infective disease. Prof Bradford has been this paper and thinks it is too speculative to be accepted. Will the Chairman please minutes his opinion. The paper together with a covering letter from the communicator (Prof McKendrick) is sent herewith for the Chairman's information. If Chairman agrees with Dr Bradford it might be suggested to the communicator to withdraw the paper with a view to publish elsewhere.' 19 February 1909