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4. A verbal communication from Dr. Hare, respecting some experiments made by him to ascertain the comparative heating or cooling influence of changes of density resulting from changes in pressure in dry air, and air replete with aqueous vapour: also, some experiments favourable to the idea that a vacuum has a capacity for caloric

9. The barometer, thermometer, hygrometer, and atmospheric appearances at sea and on land as aids in foretelling weather, with brief rules for their use, and the practical application of their separate and combined indications as weather guides