Letter: Hard to swallow
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Your support makes all the difference.Sir: Swallows returning a month earlier due to global warming (letter, 18 March)? I have been reading Gilbert White's book The Natural History of Selborne, where he notes that the swallow "appears in general on or about the 13th of April".
He goes on to recall a swallow arriving "on a sunny warm Shrove Tuesday; which day could not fall out later than the middle of March". CFCs in the 18th century?
NICK HODGSON
London W2
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