On Fuchs’s method for the determination of Iron. 227 
from deriving their water from lakes or from countries with a 
very small rain-fall. During a period when the gradual elevation 
of the sea-level was not counteracted by the eflects of more 
the Ganges, the Nile, or the Po. For the above reasons it would 
be difficult to determine, when examining sections of thick fluvi- 
atile strata, whether these accumulations of detrital matter had 
n formed during subsidence of the land, or during the gradual 
flevation of the level of rivers and seas, arising from the con- 
‘nual operation of ordinary physical causes. 

Arr. XXVIIL—On Fuchs’s method for the determination of 
Iron; by J. R. Brant. 
‘To determi amount of iron in any substance, Prof. 
Fuchs of Munich a (Erdmann, xvii, 160) a method which 
or and rapidity of execution is unequalled. It consists sim- 
ply in boiling the solution of the perchlorid of iron with a strip 
of bright sheet copper, until the iron is reduced to protochlorid— 
