SIRS,--We were interested to read Mr. Nelder's letter in your November, 1952, number (antea, vol. xlv, p. 430) and feel we should like to dispel any idea that possible bias in the collection of records is not already fully appreciated by those responsible for running the B.T.O.'s Nest Records scheme. One of us as organiser of this scheme and the other as one of the largest individual contributors to...

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