Lead. 
.235 
favour of the plan of 91. 6s. 8d. for each 'bed. Now if a 
stack consists of seven beds, and the manufacturer raises 
nine stacks, the gross amount of the saving, in the first 
instance, will be 5881. According to this plan the manu- 
facturer can set three tons of lead in a bead, when in the 
old way he can only set about 1 ton 12 cwt.; and the cor- 
rosion is more certain, from the fumes of the acid having 
free access to all the lead, which is placed upon the boards, 
instead of the rolls being confined separately in the pots 
along with the acid ; that the pots, which are placed un- 
der the joints of the stack-boards, will be filled with liquor 
or acid neutralized by being mixed with the ooze in the 
bark, and the fumes arising therefrom being condensed, 
the pots become filled, and the necessary corrosion is there- 
fore prevented. From this mode of setting lead, the ma- 
nufacturer will obtain a third more of white lead than ac- 
cording to the old way. 
2dly. The plan clearly demonstrates, that the rolls of 
lead being placed upon boards are easily taken off when 
corroded. When the stack boards are removed, the rolls 
should be well sprinkled with a watering can, which will . 
prevent the dust from rising and annoying the labourers.. 
Now, according to the old way, if the lead is well corro- 
ded, the expansion becomes so great as to fill the pots 
tight and close, and the labourer, in order to disengage 
the ceruse from the pot, is obliged to knock it upon the 
taken-off boxes, which causes a dangerous dust to arise, 
that affects the labourer witjg that most dreadful disorder, 
the colic of minerals*. 
3dly. The breakage of the pots according to this plan, 
is not as one pot to thirty in comparison of the breakage 
arising from the mode of setting. For experience tells 
us, that in the old way, we may expect a loss of 30 pots 
in 560, and of course in a stack 210, and in 9 stacks 
1890 pots. Supposing the manufacturer to take up and 
* Colica pictonum. Colic of Poictou, and Devonshire. 
