places deeper, io fome fliallovver^ in fome places narrower, m 
fonxe broader 5 but lies altogether, and is perfs^ Lead) only in 
theOurfide, covered with reMjhE^nb, 
To the ^erics in the fixth Title,/ cannot fay much • it muft 
be rcfolv'd by them, that melt the Lead-Ore^ with which / have 
not been much acquainted, faveonly, that they beat the Ore 
fmall 5 then waih it clean in a running ftream 5 then fift it in 
Iron-Rudders 5 then they make of Clay or Fire-ftone a Heaitli 
or Furnvice, which theyfet in the ground, and upon it build 
their Fire, which is lighted with Chwir-coal:, and continued with 
young Oaken-gadds, blown wifh Bellows by Mens treading oa 
them: And after the Fire is lighted, and the fire-place hot;, 
they throw their Lead-Ore upon the Wood, which melts dowri 
into the Furnace 5 and then with an Iron- Ladle they take it our^ 
and upon fand caft it into what forme they pleafe. 
So far this Account^ which is hoped will be made in time 
more compleat^ and fucceeded with the like Anfwcrs frona 
other places. 
An BxtraB 
of a Letter, fent from Paris, about the Load-ftone 5 wheri: * 
chiefly the f^ggeflion^f Gilbert touching the Circumvolts^ 
tion of a Globous Magnet^ cdVd Terrella 5 and the Va- 
riation of the Variation, is examined^ 
This Letter 137/«/ vrrltten hy the Intelligent md Experienced A^onfieur 
Petit, Intmdant of the Fortipcatms of Moft Chriftian Majefty^f^^fe 
Publifher, as followes-^ 
I Have received yours, wherein you defiretoknow myfenti- 
ment about the frefent Variatien of the Keedle-, intimating 
withal , that an Artift in London affirms , that whereas hereto- 
fore the Declination was ^^/-n^^r^j 'tis aow about degree and 
a half to the Wefl. 
Nothing can be more welcome tome, than to have occafion 
given me to difcourfe of this Subjeft^ efpecially tothephilo- 
fophers of England ^ whence the Philofophy of the M^ne^ 
Hhh % " ^ ~ had 
