200 J. M. Ordway on Sesquisalts. 
difficulty in the mother liquor, but would not settle at all in the 
wash water, and as it passed through the pores of the paper, it — 
could not be collected on a filter. 
similar substance forms—even more difficult to settle and 
collect, and as slowly acted on by acids—when an excess of iron 
is used to prepare the commercial nitrate. : at 
A solution containing one per cent of dry perchlorid of irom, 
became rusty by boiling, but would not settle at all. Yet a 
small quantity of chlorid of sodium thrown in, effected an imme- 
iate separation of the rust, and it was now completely kept back 
by a filter. The cold supernatant liquor was of a pale yellow 
color, and retained two-fifths of the iron and six-sevenths of the 
ell for dyers to recollect—by 
ith. Thirteen Ibs. of iron turning? — 
been found, by frequent trials, 10 
