343 
On the Edidcoration of Fish- OH. 
may, perhaps, be applied in some cases with advantage 
where the oil is not designed for esculent use. 
PROCESS THE FIRST. 
For Purifying Fish- Oil in a moderate Degree, and at a 
very little Expense. 
Take an ounce of chalk in powder, and half an ounce 
of lime slaked by exposure to the air; put them into a 
gallon of stinking oil, and, having mixed them well toge- 
ther by stirring, add half a pint of water, and mix that 
also with them by the same means. When they have 
stood an hour or two, repeat the stirring, and continue 
the same treatment at convenient intervals for two or 
three days ; after which superadd a pint and a half of 
water in which an ounce of salt is dissolved, and mix 
them as the other ingredients, repeating the stirring, as 
before, for a day or two. Let the whole then stand at 
rest, and the water will sink below the oil, and the chalk 
subside in it to the bottom of the vessel. The oil will 
become clear, be of a lighter colour, and have considera- 
bly less smell ; but will not be purified in a manner equal 
to what is effected by the other processes below given ; 
though, as this is done with the expense of only one ounce 
of salt, it may be practised advantageously for many pur- 
poses, especially as a preparation for the next method, 
the operation of which will be thereby facilitated. 
PROCESS THE SECOND. 
To Purify , to a great Degree , Fish- Oil without Heat . 
Take a gallon of crude stinking oil, or rather such as 
has been prepared as above mentioned, and add to it an 
ounce of powdered chalk ; stir them well together seve 
ral times, as in the preceding process, and, after they 
