MISCELLANEOUS. 341 



below the oil, which must be carefully separated 

 from it. 



Another Method for purifying it more completely. 



Take a gallon of crude stinking oil, and mix with 

 it a quarter of an ounce of powdered chalk, a 

 quarter of an ounce of lime slacked in the air, and 

 half a pint of water; stir them together; and when 

 they have stood some hours, add a pint of water, 

 and two ounces of pearl-ashes, and place the mix- 

 ture over a fire that will just keep it simmering, 

 till the oil appears of a light amber colour, and has 

 lost all smell, except a hot, greasy, soap-like scent. 

 Then superadd half a pint of water, in which one 

 ounce of salt has been dissolved, and having boiled 

 it half an hour, pour the mixture into a proper ves- 

 sel, and let it stand for some days, till the oil and 

 water separate. 



If this operation be repeated several times, di- 

 minishing each time the quantity of ingredients 

 one-half, the oil may be brought to a very light 

 colour, and rendered equally sweet with the com- 

 mon spermaceti oil. 



Oil purified in this manner is found to burn 

 much better, and to answer better the purposes of 

 the woollen manufacture. If an oil be wanted 

 thicker and more unctuous, this may be rendered 

 so by the addition of tallow or fat. 



z B 



