308 
History (^Chemical Discoveries. 
tom of declivities covered with snow, because the red substances 
are carried and deposited there by the currents. 
From four residues of the red snow, M. Peschier obtained the 
following results : 
No. I, No. II. 
Siliceous substance, 
65.50 
Insoluble substance, 
20.00 
Alumina, 
6.35 
Alumina, 
4.25 
Peroxide of iron, 
21.35 
Peroxide of iron. 
31.25 
Soluble organic substance. 
6.80 
Chalk, 
0.50 
— 
Insoluble organic substance. 
37.50 
100.00 
Soluble organic substance. 
6.50 
100.00 
No. III. 
No. IV. 
Siliceous substance. 
14.18 
Silex, 
1.25 
Peroxide of iron, 
3.25 
Peroxide of iron. 
12.34 
Alumina, 
1.75 
Chalk, 
0.20 
Chalk, 
0.10 
Organic substance and water. 
10.00 
Resinous principle, 
3.20 
— 
Organic ditto. 
2.25 
23,79 
Soluble ditto, 
1.75 
26.48 
From these analysis M. Peschier concludes, that the red co- 
lour arises from two different Causes, viz. 1. From a greater or 
less quantity of the oxide of iron spread over its surface, in a 
state of minute division, of a high degree of oxidation. 2. From 
a resinous vegetable principle, of an orange-red colour, belong- 
ing apparently to some alga or lichen. As there are many ve- 
getables containing iron, he considers it not improbable, that 
this iron may form one of the immediate principles of the ve- 
getables in question, of which only the fragments are found, 
and that, in con] unction with the resinous principle, it is the di- 
rect cause of the red colour. See BihliotJieque Universelle^ 
Dec. 1819 ; and Ann. of Phil, xc., p. 406. 
VIII. Experiments on the Alloys of Steel. By J. Stodart, 
Esq. and M. Faraday, Esq. 
A very interesting paper on the alloys of steel, by our ingenious 
countryman Mr Stodart, and by Mr M. Faraday, has appear- 
ed in the last number of the J ournal of Science, (N° xviii. p, 319») 
