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ONE of these Hygroscopes being conveigh'd into a small Receiver, when the Air was ex∣hausted, the Index did not sensibly alter it's Place in a long time; till the External Air was let in again. From which Experiment, and some o∣thers try'd with a Thermoscope, it appears, that the Aether, or that subtle Matter which succeeds in the Place of the exhausted Air, is neither hot, cold, moist, nor dry.