( '99 ) 
V. Experiments concerning the EJfeBs of Air pafs d 
through red hot Mettals , &c. By Mr F . Hauksbee, 
E % S . 
I N order to find what EfFed fuch a Medium, as Air 
paffed thro’ red hot Mettals, might have on the 
Lives of Animals, I contrived the following Method. 
I took a large Receiver open at top, in Diameter about 
4 Inches, which was covered with a Brafs Plate and wet 
Leather, as ufual in Glaffes of fuch a make. To this 
Plate at top (which had a Screw with a fmall Perfora- 
tion) belonged a Cock, and from that Cock proceeded 
a fmall hollow Wire, about 3 feet in length: That End 
of this hollow Wire, which was remote from the Re- 
ceiver, was put into a hollow Piece of Caft Brafs, pretty 
thick in fubftance, but the Hole was not quite through : 
And the Hole being larger than the fmall hollow Wire, 
it was wedg’d into the fame with Pieces of Steel Wire, 
till the Caft Brafs was fill’d as full as it could contain. 
In this manner it was put into a Charcoal Fire, and 
there it lay till it was throughly red hot. The Recei- 
ver being then exhaufted of its Air, the Cock on the 
upper part of it was turn’d, which gave liberty for that 
Air only, which of necefiity muft pafs thro’ the red 
hot Mettals, to fucceed. This Air firft pa fling down 
thro’ the fmall Duds between the red hot Wires, before 
it could come to enter the red hat hollow Brafs Wire, 
mutt of neceflity fuffer or undergo fuch a Change, as 
Fire or the Fumes of fuch red hot Mettals would give 
it. When the Receiver was fill’d with this Air, and had 
flood fome little time, the Brafs Cover was taken off, and 
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