Letter from David Lambert Lack, on a paper 'The mobbing behaviour of the chaffinch (Fringilla coelebs) with special reference to the waning of the response' by Robert Aubrey Hinde, to D C Martin Paper reference code: B.32 Has read Hinde's paper and believes it is well worth publishing, but it is probably too long in its current form. [The paper was eventually split into two parts, both published in the same volume of Proceedings B in 1954]. Received 19 September 1953 17 September 1953