112 On the EdulcorationofFi/h-Oit. 



ftirriag, add half a pin-t of water, and mix that alfof \\4t^ 

 them by the fame means. When they have flood an hour 

 ©r two, repeat the ftirring, and continue the fame treatment 

 at convenient intervals tor two or three days ; after which 

 fiiperadd a pint and a half of water in which an ounce of fait 

 is diirolved, and mix them as the other ingredients, repeat- 

 ing the (Ijrring, as before, for a day or two. Let the whole 

 then Hand at reft, and the water will fink below the oil, and 

 the chalk fubfide in it to the bottom of the vcU'el. The ojl 

 ■will become clear, be of a lighter colour, and have confider- 

 ably lefs fmell, but will not be purified in a manner equal to 

 what is efl'edled by the other procefles below given ; though, 

 as this is done with the expcnfe of only one ounce of fait, it 

 may be praftifed advantageoufly for many purpofes, efpecially 

 as a preparation for the next method, the operation of which 

 will be thereby facilitated. 



PROCESS THE SECOND. 

 To purij}', to a great Degree, Fi/Jj-Oil ivhhout Heat. 



Take a gallon of crude ftinking oil, or rather fnch as has 

 been prepared as above mentif)ned, and add to it an ounce 

 of powdered chalk; ftir them well together feveral times, as 

 in the preceding procefs, and, after they have been mixed 

 fome hours, or a whole day, add an ounce of pearl-alhes 

 diflTolved in four ounces of water, and repeat the ftirring as 

 before. After they have been fo treated for fome hours, put 

 in a pint of water in which two ounces of fait are diflTolved, 

 and proceed as before: the oil and brine will feparate on 

 Itanding fome days, and the oil will be greatly improved both 

 in fmell and colour. Where a greater purity is required, the 

 quantity of pearl-afhes muft be increafed, and the time before 

 the addition of the fait and water prolonged. 



If the fame operation is repeated feveral times, diminifliing 

 each time the quantity of ingredients one-half, the oil may 

 be brought to a very light colour, and rendered equally fweet 

 in fmell with the common fpcrmaceti oil. 



By this procefs the cod- oil may be made to burn; and, 

 when it is fo putrid as not to be fit for any ufe, either alone 

 or mixed, it may be fo correfted by the firft part of the pro- 

 cefs as to be equal to that commonly fold : but where this 

 procefs is praftifed in the cafe of fuch putrid oil, ufe half an 

 ounce of chalk md half an ounce of lime. 



PROCESS 



