m 
Bra$$» 
\ 
since we daily swallow a hundred times more when we 
eat game, without being incommoded by it. From these 
facts, and many others, it results, that if vessels of tinned 
copper occasion illness, they ought rather to be ascribed 
to the want of tinning than to the latter. 
Paragraph III. 
Of Tinning considered as soluble in alimentary Acids * 
Eight saucepans, each capable of containing twenty 
ounces of water, were tinned with the following alloys : 
The 1st, with pure tin. 
2d, with tin having 0.05 of lead* 
3d, - * 0.10 
4th, - . 0.15 
5th, - - 0.20 
6th, - - 0.25 
7th, - - 0.30 
8th, with equal parts of tin and lead* 
Tinning with pure lead was impossible. 
Into each of these pans there was put a pound of red 
Wine vinegar, which was boiled till it was half consumed* 
The vinegar of each pan was poured into a glass vessel, 
and suffered to remain at rest for twenty-four hours. The 
vinegar was then poured off, and the precipitates were 
well washed : each portion of vinegar was mixed with an 
equal quantity of distilled water ; equal parts of each were 
put into the vessels, and three rows were formed of eight 
vessels each. The vessels of the first and second rows 
contained vinegar ; those of the third, sediments. Near- 
ly four ounces of the sulphat of potash were poured into 
each vessel of the first row, and into those of the second 
and third row about four ounces of hydro-sulphurated 
water. In the first row no precipitate was observed, con- 
sequently there was no lead : in the vessels of the second 
jrow there was observed a slight chesnut- coloured sedi- 
