The present observations were made in order to ascertain whether different plants and flowers influence the temperature of the air immediately over them. The author was induced to undertake the inquiry from what he had noticed whilst making observations on the fall-cloud, or white mist of the valley, as it is usually called. In the autumn of 1858 it was repeatedly noticed that vapour formed first over those fields from which hay had been gathered in the summer, and which were covered with a good crop of
after math
. The mists then gradually formed over the shorter grass of the pasture fields, yet, unless when the fog was very thick, it never formed over stubble fields (
i. e
. where corn had grown). It was further observed, that at times when undrained or imperfectly-drained ploughed fields had this mist, those that were better drained were free from vapour; moreover, the furrows or low places of a field were the spots on which fogs first formed.
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