on Ignited Bodies . 577 
which it hung than on the other, which being lefs 
heated, would confequently be lefs expanded; and this 
difference of expanfion might produce the error in M. 
buff on’s account of the weight of heated iron. 
If thefe obfervations afford you any fatisfadtion, it 
will give me pleafure. 
I am, See- 
/ 
XXXIX. An 
