236 
bead* 
set four rounds of stacks in one year, the number of pots 
broken will be 7560, which, at 5d. each pot, amounts to 
1571. 10s. These nine stacks of pots in the old way 
would cost 735lj according to the new plan only 147L 
leaving a difference of 588L as stated under the first head 
of observations. Exclusive of the savings before enume- 
rated, it must be of very great benefit to the manufactur- 
er that he can bring into the market, in the same given 
time, a third more of white lead by pursuing the plan be- 
fore specified, than by the old modes. 
27 Month . Mag. 331 and 588, 
RED LEAD. 
t PROCEED now to the manufacture of Med Lead and 
massicot ; but I must defer the plate I propose to attach 
to my account of this manufacture to the next number, 
the present being supplied with the usual quantity, and 
not being able to procure in time the engravings necessa- 
ry to illustrate the subject of lead. 
The following account of red lead from the excellent 
Essays of Bishop Watson (of Landaff) is proper to in- 
troduce the subject, 
“ IF the reader does not know what minium or red 
lead is, I would wish him to send for a few ounces of it 
to his painter or apothecary. Supposing him to have a 
parcel of red lead before his eyes, the first thing which will 
strike him is its vivid colour verging a little towards 
orange ; if he crumbles it between his fingers, he will find 
it to be an almost impalpable powder ; if he poizes it in 
his hand, he will perceive it to be much heavier than 
either brick dust or red ochre, with which substances it is 
sometimes adulterated ; if he compares it with a piece of 
lead, he will be astonished how it can be either produced 
