On the Eduleoration of Fish- Oil. 347 
vessel, and render the purified admixture a considerable 
saving to the manufacturers. 
Secondly , The different qualities and dispositions of 
different parcels of vicious oil with respect to edulcora- 
tion render various proportions necessary of the ingre- 
dients to he used. The quantities stated in the above 
process are the least which will effect the end in general, 
and frequently greater will be required ; but this may al- 
ways be first tried : and if it be found, after six or eight 
hours simmering of the mixture, that no gradual improve- 
ment is making in the smell and colour, but that the oil 
continues the same in those particulars, and remains also 
mixed with the chalk and lime, and in a thick turbid 
state, a fourth or third part of the first quantity of pearl- 
ashes should be added, and the simmering continued till 
the oil be perfect. As the quantity of the water is lessen- 
ed by the evaporation, it is necessary to make fresh ad- 
ditions from time to time, that there may be always near- 
ly the original proportion. 
Thirdly , If it be inconvenient to give the whole time of 
boiling at once, the fire may be suffered to go out and be 
rekindled at any distance of time ; and if, in such case, a 
|| small proportion of pearl-ashes dissolved in water be add- 
| ed, and the mixture several times stirred betwixt the 
times of boiling, it will facilitate the operation. The 
time of boiling may be also much shortened, if the chalk, 
lime, and pearl-ashes, be added for some days before, 
and the mixture frequently stirred. 
PROCESS THE FOURTH, 
Which may he practised alone instead of Process the 
First , as it will edulcorate and purify Fish- Oil to a 
considerable Degree , so as to answer most Purposes , 
and for Process the Third , when the whole is performed . 
Take a gallon of crude stinking oil, and put to it a pint 
of water poured off from two ounces of lime slaked in 
