104 Scientific Intelligence. 
portion of the chlorid is supposed to decompose during the experiment, 
through the humidity of the air; and in this way M. Pierre accounts 
for the variation in the above results. Believing that the first three 
results are most correct, he adopts 2m number 314°69 (or on the hy- 
oe scale, 25:13) for the equivalen 
7. On the compounds of Iron with Sie tee by M. eer Rscar 
Berlin Akad., Nov. 5, 1846; Chem. Gaz., March, 1847.)—The deter- 
mination of the amount of carbon’ in the: dillienes kinds 7“ a iron, 
steel and pig iron, are still variable and uncertain, partly owing to the 
estimation of the amount of carbon being very tedious if not difficult, 
and partly because the limits between bar iron and steel, as well as be- 
substances takes place in indefinite ons aeamd uninterruptedly, from 
f carbon, whi abo 
0 to the maximum amount of ca ch is ut 5°93 per cent. 
The classification of the —— of i iron in three divisions, bar iron, 
steel, and pig iron, is consequently not necessary, i. e., not required, by 
the combining proportions, ot Aibelly arbitrary. 
- To determine re amount of carbon, the best methods of separating 
the carbon from iron were em ployed ; but in order to ascertain the de- 
closely to the maximum amount which iron is capable of taking up. 
The amount of carbon — this pig iron was found, by different meth- 
ods of analysis, as follows : 
Per cent. 
By elementary analysis with oxyd of copper, the carbon be- 
ing calculated from the carbonic acid gas, 2835 
By urns analysis eure “i potash and chro- iy 
ma ae ad, ‘ 5°7046 
By decom poaltion oe 4 bd an 
y ecompoaition of thiontd of copper A F - BSL. 
2d experiment, Pp — - 56978 
By decomposition of pérehloyid of iron pci 
Experiment with sublimed chlorid of iron, - 54232 
ith perchlorid prepared in the moist way, 52867 
By decoriposition of chlorid of Britis 5 - oS et ee 
xperiment, 
