C 93S ) 
Though this fault be moft found in this fort of Iron; yef, 
if in the working of their Beft fort they omit any one Procef?, 
it will be fure to want ibnie part of its Toughnefs, which ihcy 
efteem its perfedlion. 
\4 R^i^^ionof the makhgof Cerufs, (?y Sir Philiberto VernartL 
F'lrft Pigs of clean andfofc Lead are eaft into thin Plates a 
yard long, fix inches broad, and co the chicknefs of the 
back of a Knife. Thefeare rolled, with fonie Arr^ round ; buc 
foas the Surfaces no where meet to touch : for where they do 
QO CeruJ? grows. 
Thus roll'd , they are put each in a Pot juft capable to 
hold one, upheld by a little Bar from the bottom, that ic 
come nor to touch the Vinegar, which is put into each Pot, to 
effeft the convcrfion. 
Next a fquare Bed is made of new Horfe-dung, fobig as to 
hold 20 Potsabreaft, and fo to make up the number of 400 in 
one Bed. 
Then each Pot is covered with a Plate of Lead ; and laftly 
allvvith Boards, as clofe as conveniently can be. This re- 
peated four times, makes one heap, focalledj containing 1600 
Pots. 
After three Weeks the Pots are rakenup,the Plates unrolled, 
laid upon a Board, and beaten with Batclc-dores till all the 
Flakes come off. Which^ if good, prove thick, hard and 
weighty : if othetwife, fufly and light • or fometimes black 
andburn'd,if the Dung prove not well ordered: and fome- 
times there will be none. 
From the Beating- Table the Flakes are carried to the Mill ; 
and with Water ground between Miliftones , until they be 
brought to almoft an inpalpable finenefs. Afcer which it is 
mouWed into fmaller parcels, and expofed to the Sun m dry 
till it be hard and fo fit for ufe. 
The Accidents to the Work are, 
That two Pots alike ordered, and fet one by theother^ 
without any poffible diftindiion of advantage, fliall yield, the 
one thick and good Flakes, the other few, andfmall or none: 
which happcneth in greater quantities, even over whole Beds 
fome.imes* 
Some- 
