S I R S , -- I have read Mr. A. W . Boyd's " Report on t h e Swallow Enquiry, 1935 " {antea, pp. 98/116) with much interest. I n Dumfriesshire, there is a belief t h a t t h e presence of Swallows i n a cow-byre ensures good luck. I t is certainly curious t h a t , in 1932, Swallows failed t o build--for t h e first time in many years--in a cottager's byre and t h a t his cow should, after yielding blo...

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