| iurtz’ Contributions to Analytical Chemistry. 191 
eans of effecting this are so obvious that no doubt ev oy 
yst has adnate them upon occasion ; but the cases in whic 
occ not often met with. Especially when working 
mn. iron a ge hematitic or silicious, containing car- 
ates, phosphates, etc., is the use of acids inadmissible. 
_ possess, however, agents which while readily dissolving 
iron, are ee not to act upon its oxyds. Chlorine 
eous 
Nae of bromine, or still better, of iodine, may be substituted 
for that of chlorine, It was hoped that with iodine water, even 
« limed) sesquichlorid of iron. This is, however, open ‘to the same 
- mee because while e dissolving ‘the metallic iron, it will also 
a : sly, 
is ‘odin ater to remove “thé metallic iron. 
. roa with ay contained in te metallic particles will 
course the earbon 
remain, but the quantity of this will be so small that it may 
usually ‘be neg! 
Other substances, of an oxydable character, may be present in 
some case to interfere with complete success, such as metallic 
