NOTE UP % ON SESQUINITRATE OF IRON. 93 
nitrate of the black oxide by absorbing three equivalents 
of oxygen, becomes converted into eight equivalents of the 
sesqui-nitrate of the sesqui-oxide, and one equivalent of 
sesqui-oxide, which precipitates. 
From these facts it is evident that the name of this pre- 
paration is chemically incorrect, as it is the nitrate of the 
black oxide, and may be represented thus: Fe 0, Fe 2 O 3 
+ 4 NO 5 + aq. 
Under these circumstances it becomes necessary to change 
the form of administration from that of solution to a syrup, to 
ensure permanency of character and effect. Such a pre- 
paration, Dr. Hays, of this city, tells me he has been using 
for several years. In making it I have pursued Mr. Kerr's 
formula, using, however, only half the quantity of water, 
and dissolving in this a little less than twice that proportion 
of sugar. The unnecessary hydrochloric acid I dispense with. 
Take of iron wire free from rust and cut in pieces 6 drs. 
Nitric Acid i.lh oz. 
Water - - - - - - f.8 oz. 
Sugar - - ... - _ - 14 oz. 
Add to the iron the acid previously mixed with the 
water, and set aside the mixture for twelve hours, thai the 
acid may be saturated. Decant the liquor from the undis- 
solved iron, add the sugar which you dissolve in it by heat, 
and finally strain. 
It has been found to keep in this form, and is doubtless 
improved as well in taste as in appearance. 
Its properties are all tonic and astringent. 
VOL. XT. — no. n. 9 
