Chemistry and Physics. 281 
drying of a tubful of sulphate of lead (from 500 to 1200 pounds) was 
_ impracticable, and samplin i 
n 
_ Ttook a strong oaken pail, weighing eight pounds when empty, and 
caused a black mark to be burnt in horizontally around the inside of the 
hold 126 pounds of pure 
4 The specific gravity of water being 5°3 less than that 
of sulphate of lead, it followed that if there was one pound of water in 
body is immersed in a liquid it loses a portion of its weight, 
to the weight of the fluid which it displaces, or to the weight of its 
bulk of the liquid. 
as I suppose, is precisely the principle applied by Mr. Méne, 
precipitate he obtains by a certain chemica manipulation is a sub- 
“tela of known composition and specific gravity. Supposing it to be sul- 
late of lead, and the bottle, when filled with water at the normal tem- 
phe to weigh 70 grammes ==50 grammes of water, and 20 for tare. 
’ pubdate the precipitate and filling again with water it weighed 
Dike ammes. Now, as the specific gravity of sulphate of lead is 6:3, 
ik © weight of a cubic measure of sulphate of lead is 6:3 times that 
cubic measure of water, and as the space of one part by weight of 
en up by 6:3 parts by weight of sulphate of lead, it follows 
ntity of sulphate of Jead in the bottle, which has taken up the 
y weight of water, increases the original weight of the 
(filled with pure water) by 5°38. To find the amount of water 
other liquid (that of water being =1) and add the quo- 
. verweight, which gives the weight of the precipitate. 
tor of the Jahresbericht appears to have overlooked the fact 
eig 
apes No. 86,—MARCH, 1860: 
