History of Chemical Discover ks. 
IX. Chemical Analyses. 
1. Fyro-Uric Acid. — MM. Chevalier and Lassaigne found 
tliat this acid, in a state of purity, consisted of 
Oxygen, - 44.32 
Volumes. 
7 
Carbon, - 28.29 
12 
Azote, - 16.89 
3 
Hydrogen, 10.00 
254 
99.45 
2. Pyro-Urate of Lime consists of 
Pyro-uric acid. 
91.4 
Lime, 
8.6 
3. Suhpyro-Urate of Lead consists of 
Pyro-uric acid. 
28.5 
Oxide of lead. 
71.5 
See Jou7'n. de Pharm. vi. 58. 
4. Combinations of Iron and Sulphur . — The following table 
of the combinations of iron and sulphur has been given by Mr 
Porret : 
1. Cubic Pyrites, 
( 1 atom iron, 
1 1 atom sulphur. 
1.75 
2.00 
2. Magnetic Pyrites, 
J 2 atoms iron, 
I 1 atom sulphur. 
3.5 
2.0 
3. Sesquisulyhuret, 
( 3 atoms iron, 
( 2 atoms sulphur. 
5.25 
4.0 
4. Tritosulphuret^ 
f 4 atoms iron, 
( 3 atoms sulphur. 
7.0 
6.0 
Ociohcdral Hon^Ore. 
Protoxide of 
iron, 94 
Oxide of titanium, 6 
Robiquet, Journ. de Pharm. v. 258. 
6. Sulphuric Acid, according to Berzelius, consists of ^ 
Sulphur, - 100.00 
Oxygen, - 148.41 
T. Ferrochyazic Acid, -according to Dr Thomson, is compose<l 
2 atoms carbon. 
1.500 
1 atom hydrogen, 
0,125 
1 atom azote, 
1.750 
4 atom iron, 
1,750 
5.125 
