EXPERIMENT IV.
TWO Ounces of small Lumps of Marcha∣sites, which were partly shining, and part∣ly darkish, and seem'd well dispos'd to yeild Vitriol, were kept in a pure Air, and gain'd 12 Grains in Weight in seven Weeks.
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TWO Ounces of small Lumps of Marcha∣sites, which were partly shining, and part∣ly darkish, and seem'd well dispos'd to yeild Vitriol, were kept in a pure Air, and gain'd 12 Grains in Weight in seven Weeks.