C9<0 
difcontinued by 'reafon of the great Mortality in London^ 
where they were begun to be Printed, it hath been thought 
fit to embrace the fame, and to make ufe thereof for the 
gratifying of the Curious, that have been pleafed to think 
well of fuch Communications: To re-enter whereupon,, 
there offers it felf firftof alia Relation of an uncommon 
'Burning clafs , not long fince made in France^ in the Gity of 
Lyons^ by one called Monfieur de Vilette , as it was fent to 
the Publj]hero£ thc(c7ra£ts i in two Letters, whereof the one 
was in La fine , the other ir r French, to this effeft : 
Concerning the Efficacy of Monfieur de Vilette his Burning 
Glafs, all what the P.Bert^t hath written of it, is true. 
We have feen the Effcds of ir repeated over and over again 5 
in the Morning, at Noon, and in the After-noon, always 
performing very powerfully 3 burning or melting any Mat- 
ter, very few excepted. The Figwe of it is round, being 
thirty Inches, and fomewhat better, in Diameter. On one 
fide it hath a Frame of a circleof Steel, to the end that it 
m?y keep its juft Meafure ; ’Tis eafie to remove it from 
place to place, though it be above an hundred weight, and 
Vis eafily put in all forts of poftures. The burning Point is di- 
stant from the Cenrre of the Glafs, about three Feet. The 
Focus is about half a Louysd'or large. One may pa fs ones 
hand through it, if it be done nimbly , for if it ftay there 
the time of a fecond Minute, there is danger of receiving 
much hurt# 
Green wood takes fire in it, in an inftant? as do alfo many 
other Bodies. 
A fmsll piece of Pot-Irony? as melted, and *, rn „j r 
ready to drop down, in 40. 
A Si her Piece of 1 5 Pence was pierced, in 24, 
A groj ) Nail (called le Clou depaifan') was meltcd,in 3c. 
Tfie end of a Sword- blade ofoiinde-y was burn’d, in 43. 
A Leafs. Count tr was pierced, in o 5 . 
A piece of red Copper was melted, ready to drop 
down, in 42. 
A piece 
