To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.
TAke a Wind-gun (which new Artifice is now com∣mon) and weigh it exactly when empty, then by plying the Pump-staff charge it soundly and weigh it again, and you shall find it much heavier then before; yea, a large Bladder, full blown, will weigh more then its self emptied, and manifest this inequality upon a ticklish pair of Scales.
Now though this Experiment seems onely to evince the gravitation of Ayr condens'd, yet it consequentially follows, that Ayr also in the Liberty of its own Sphaere, is proportionally ponderous (though it is a difficult point Mechanically to evince it, unless we were actually above the Atmosphaere, or in a Vacuity to weigh it there in a thinner medium then here we are able to do;) yet, if I mistake not, I have an Experiment in Banco which will give some Mechanical Evidence of this great Mystery, which here, with all its consequences, I shall deliver.