December 1954 – vol. 47, issue 12–441 (Fair Isle Bird Observatory). T H E large size of the Merlins (Falco columbarins) trapped when on passage at Fair Isle in 1950-1951 led me to doubt the statement in The Handbook (Vol. I l l , p . 23) that resident British birds are augmented in autumn by "continental migrants arriving northern and western isles." As the Iceland bird had been separated on its darker colour and longer wing as Falco c.... This article is only available to registered users.To read more, please log in or purchase a subscription.