SIRS,-- With reference to the suggestion t h a t the increase of Gannets on Grassholm (1922-1924) might have been due to birds from Ailsa Craig (antea, p. 151), I must point out t h a t there was also an increase on the latter island a t t h a t time. During the years 1922-1925 I spent a n annual fortnight on the island and always noted an increase. During 1924 in many places the Gannets had ouste...

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