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From the Preface. IN the preliminary Chapter on the Atmosphere I have referred to De Luc's 'Recherches sur l'Atmosphere, Robertson on the Atmosphere, and Dalton's Essays. The barometric table of the mean height of the mercurial column for every day in the year is, I believe, the first of the kind that has been deduced; it is the result of thirty years' observations, made by myself in one locality. In the name of Henry my table of daily mean temperatures was used for two or three years, at the Royal Observatory, as a standard of comparison for the temperatures in the weekly report of the Registrar-General, and it was only discontinued when the establishment had accumulated sufficient data from which to deduce a standard of their own: that public acknowledgement of confidence in the accuracy of those results, together with my professional character as an observer, will give the value of authenticity to the Table now published. The phenomena of the winds and clouds, in their connection with the movements of the barometer, though deduced from observation and experience, are not set forth as dogmas, but as helps, for the interpretation of the meteorological appearances of our very irregular and unsettled climate. The nomenclature of the clouds is Luke Howard's, by whom, when a young observer, I was favored with a presentation copy of his valuable work on the Climate of London. --J. H. B. Hyde Vale, Greenwich, April 1849.

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