August 1933 – vol. 27, issue 3–80 SIRS,- --In his " Survey of the Rooks in the Midlands," Mr. Roebuck deals (antea, p. 23) with the change in population on breeding. But in only a few lines he tells us that, after May, either a wholesale slaughter in some rookeries or a gradual fall in numbers in the others reduces the population by the end of August to the January total. It seems a pity that he does not provide anv of the evidence ... This article is only available to registered users.To read more, please log in or purchase a subscription.