( i8o6 > 
Si tanicn Exliterit aliquis ingenii adeo livldi & Sceptici, 
ut pr^miffis (idem detrahajt ^ conflilat velim ClariiT Schen- 
kij Obfervat. cap. de calculo vefic. et turn forte conccdat me 
non plane c<VyWTA,& «^y^-AT* hie loci fradidiffe. 
Malbafii, JutJ, 1704 
VI, An Experiment made at a Meeting of the tf^. Socie^ 
/jf, Decemb. xo. 1704. Of firing Gun-powJer on 
a red hot Iron in Vacu6 Boyliano. Mr Fr. 
Hauksb^f. 
THe Candent Iron being included in a Elecipient pro- 
per for that purpofe , and the Air vvichdriwn 
( which was in about two minutes of time) the Mercury 
then in the Gage (landing at 29 inches 5*, a quantity ot 
Guopowder was made immediately to «lefccnd upon the 
red hot Iron, which confinu'd upon the furface of it 
fome fmall time before it went off, and then was oI> 
ferv'd not to fire all at once ^ and the laft of the Quantity 
that did fo, feem'd to give the greateft fla(h : Upon 
which, the Mercurial gage was taken notice of to defcend 
fomething more than an Inch, it rifing again of the 
fame. And upon feveral Repetitions of the like quantity 
of Powder ( the factitious Air being always firft with- 
drawn) the Appearances were very refembling. Again, upon 
Purging the Recfpicnt of thefiftirions Airland the Mercury 
elevated in the Gage as at firft, three quantities were caused to 
defcend upon the Iron, whofc ExpIo(ion,as well as the Air 
produc'd from them, feem'd in proportion to the quantity 
of Powder : The Mercury then in the Gage fubfiding to 
2 5. But upon dropping 6 Quantities ( the Recipient be- 
ing firft purga as before ) which Qaaritities not defcend- 
ing all at once, but fucccffively as taft as might be, the 
