230 
Lead . 
knowledge of their own dispositions, that you would ne- 
ver give, except what was of little worth. If you set no 
value on your own property, what obligation is there on 
the public, to consider it as valuable ? I forgot to men- 
tion that in my patent for bleaching, I mean to include 
the manufacture of white lead, as connected with it. I 
know of no means so proper to make the process of value 
to the public, and introduce the use of it. 
But to my immediate purpose. The process of making 
white wine vinegar in England is as follows. 
In an oblong room heated by stoves to the degree of 
about 80 of Fahrenheit, place upon tressels a series of 
quarter casks, high enough from the floor for a pail or tub 
to stand conveniently under the casks, from which the 
liquor is drawn. The top of the quarter casks is pierced 
full of auger holes. The casks are filled with cyder. On 
the top of the casks, is placed a tub full of Malaga raisins, 
the bottom of the tub being likewise pierced with auger 
holes. A man is employed from morning to night, in 
going round this series of quarter casks, and drawing from 
the bottom of each, a pail or bucket full of cyder, which 
he pours on the top of the Malaga raisins. The cyder 
percolating through the body of the Malaga raisins, ac- 
quires a saccharine mucilage, together with a vinous fla- 
vour ; and by degrees is converted into vinegar. The 
raisins may be employed with a little addition to give fla- 
vour to two casks of vinegar. When the cyder is thus 
converted into vinegar, it is drawn off, and the casks be- 
ing replenished with cyder, the same routine is again pur- 
sued. The vinegar is fined with white of egg, racked off, 
and is then ready for sale. 
During the percolation of the vinegar through the Ma- 
laga raisins, so much acetous acid evaporates and is wast- 
ed, that if plates of sheet lead or copper were hung up in 
the room, a, manufacture of white lead or of verdigrease, 
