Letters

01 April 1967 Comments Letters Eruptions of Great Tits and other species Sirs,--I was interested in Dr. C. M. Perrins's paper on the effect of the seed crop of the beech Fagus sylvatka on the populations and movements of the Great Tit Partis major (Brit, Birds, 59: 419-432). To strengt...
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Letters

01 November 1936 Comments Letters 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...
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