Letter from Percival Hartley, on a paper 'The route by which antibodies enter the circulation after injection of immune serum into the exocoel of foetal rabbits' by Francis William Rogers Brambell, Hemmings P Gwynneth, W A Hemmings, Megan Henderson and W T Rowlands, to D C Martin Paper reference code: B36 Hartley is 'satisfied' with the numerological aspects of the paper, however he is unfamiliar with the advanced zoology. As Brambell is an 'expert authority' on the subject Hartley remarks it should be 'almost certainly all right', however suggests the Secretaries may like a more expert opinion. Written at 12 Bigwood Road, London [England]. [Published in Proceedings B, 1951]. Endorsed on recto as received 22 September 1950. 21 September 1950