Page:Philosophical Transactions - Volume 024.djvu/478

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(1948)

difficult to judge to a nicety in so sudden a motion; but there was a sensible difference betwixt the rebound of those dropt in Vacuo, and those in Air condens'd. I could not observe that the small difference in the weight of the Marbles made any discernable alteration in their Resilitions.

V. An Experiment on the descent of Malt dust in the Evacuated Receiver, at Gresham College. By Mr Fr. Hauksbee.

I took some Malt dust, and having well dryed the same, put a quantity of it into a fine Muslin Bag, where being loosely inclos'd, would upon shaking discover it self plentifully in the open Air, undulating and floating a considerable time before it would descend; but being included within a Receiver, from which the Air was well exhausted; and then shaken, the dust descended as a ponderous Body, precipitating in strait lines from the top to the bottom of a tall Receiver.

London, Printed for Sam. Smith and Benj. Walford, Printers to the Royal Society, at the Princes Arms in St Paul's Church-yard, 1705.
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