34$ On the Edulcoration of Fish - OIL 
part soon acquires the same state, and the oil again grows 
foBtid, though not to the same degree as before. 
Water is, however, a necessary medium for the ac- 
tion of salts and the separation of alkaline earths and 
calces of metals when they are employed for the edulco- 
ration of oils, as will appear from a consideration of my 
processes. 
Air edulcorates oil by carrying off the most putrid 
parts, which are necessarily extremely volatile. It may 
be made to act on them either by simple exposure of them 
to it with a large extent of surface, or by forcing it 
through them by means of ventilators, as has been pracv 
tised by some dealers ; but is now, I believe, neglected 
on account of their finding the improvement of oils by it 
not adequate to the trouble, as the gelatinous matter and 
bile, not reduced to a certain degree of putrefaction, be- 
ing left behind, putrefy again to nearly the same degree 
as before. 
It appears from these several observations, that the 
cheapest ingredients which can be used for the edulcora- 
tion of train-oils are lime and chalk, which may, with 
the addition of a proper quantity of solution of sea salt or 
brine, be made to procure a separation of them from the 
oils, according to process the first, so as to answer for 
some purposes ; that the lixiviate salt is the most power- 
ful purifier of Mis, and, with the assistance of chalk and 
brine, will, without heat, according to process the se- 
cond, effect a very considerable degree of edulcoration; 
and that lixiviate salt used with heat, with the addition 
of lime and chalk, to save a part of the quantity which 
would otherwise be necessary, and of brine to procure a 
quick separation, will perform an edulcoration sufficient 
for all commercial purposes, according to process the 
third; but that calcined lead and the ochrous earth of iron 
