an eredPofture, and as at a great diftance ; but the Ey 
being farther off than the Foc^^y all things appear inverte^^i 
and without the Sfeculum : And became the Focus is tw<^ 
Ells off, it is pleafant to fee Objefts diftinftly as it wer^ 
hanging in the Air ; and if a Sword be drawn againft th^ 
Speadumy a Speftator not ufed to fuch Optical Delufions? 
would be apt to oe Frighted, Imagining a Pafs to be made 
at his Face. 
The Force of this <S^^^^/^;^ in Burning is fuch, that e- 
ven ChymiJlsyWho beil know £he power of Fire^ will iiard- 
!y credit it, unlefs they fee it with their own Eyes. For 
( I ) a peice of Wood put into the Foms Flames in a Mo- 
ment^ 10 as a frelli Wind can hardly put it out. ( 2 ) Wa- 
ter applyed in an earthen Veffel prefently Boyles, fo as 
to Bo yle an Egg, and the Veffel being held there fome 
time, the Water evaporates all away. ( 3 ) A peice of 
Tinn or Lead three Inches thick, as loon as it is put into 
the Focusy melts away m drops, and held there a little 
time is in a perfed F/uory fo as in two or three Minutes 
to be quite pierced through. ( 4 ) A plate of Iron or Steel 
placed in the Focus immediately is feen to be red hot on 
the backfide ;and foon after a hole is Burnt through;! have 
made three fuch holes in a plate, in fix Minutes time. 
( 5 Copper, Silver and the like applyed to th^Foms 
melt, which t have tryed with feveral forts of Coin ; 
among the reft with a Rix Dollar, and the fame hapned 
to it as to the aforefaid Iron Plate in 5 or 6 xMinutes. ( 6 ) 
Things not apt to melt as Stones, Brick and the like, iboa 
become red hot like Iron. ( 7 ) Slate at firft is red hot, but 
in a few Minutes turns into a fine fort of black Glals, of 
which if any part be taken in the Tongues and drawn 
out, it runs into Glafs threads. ( 8 ) Tiles which had fuf- 
fred the nioiHntenle Heat of Fire, in a Uttle time melt 
down into a yellow Glafs, as do. ( 9 ) Pot-fhreads, not 
only well burnt at firft, but much uled in the Fire, into a 
blackilh-yeilow Glafs. ( 10 ) Pumice-Stone faid to be tha^ 
Of 
