( 97 ) 
A piece qf a chambtr guarrj-fome was vitrified, fee. 
and put into a Glafs-drop, in 45. 
Steely whereof Watch-makers make their fprings, 
was found melted, in 09. 
A Mmeral‘jt0ne o fuch as is ufed in Harquebufles 
a ronets was calcin’d and vitrified, in 1 .juft, 
A piece of Merterw as vitrified, in 52. 
In &ort 5 there is hardly any Body, which is not deffroy- 
ed by this Fire, if one would mdt by it any great quantity, 
of Mettal> that would require much time, the A&ion of 
Burning not being perform’d but within the bignefs of the 
Focus,- fo that ordinarily none but fmall pieces are expofed 
to it. One Monficuf d'Alibert buys it, paying for it Fifteen 
hundred Livres. 
Since this Information, there were, upon occafion given, 
from hence, upon the fame fubjed, further communicated 
from PArif t he folk wv.g particulars .* 
I fee by two of the Letters, that you incline to believe, 
the Glaffes of Mtygfefo and Sepiahm do approach to that of 
Lyons: Slit I can allure you, they come very Far fhort of it. 
You may corn J r Magmas his Book, where he deferibes his 5 
-and there are fb me Per fens here that have feen one of his 
beif, which had but about twenty Inches diameter j fo that 
this of Lyons mu ft perform at lead twice as much. As to 
Sept aim, weexped the Relation!©! it from Intelligent and 
Impartial Men. ft cannot well be compared to that of 
-Lyons , .'but -in bignefs and in this cafe, if it have five 
Palms (as you fay) that would be about feet French , and 
fo it were a Foot bigger, which would make it half as much 
greater in fur face : But as to the Effeds, feeing it burns fo 
far off, they cannot be very violent. And Iha ve heard one 
fay, that had feen it, that k did not fet Wood on Fire but 
; after, the timepf faying a Mifcrere. You may judge of she 
-difeence of the. E ffVds, fine©: tha t of Lyons gathers its 
-Beams. toge|f)er within the fpace of feven or eight -Lines 5 
O 2 and 
