On Painting. I j^ 



till the oil be perfec?!:. As the quantity of the water is lef- 

 fened by the evaporation, it is neceflary to make frefli addi- 

 tions from time to time, that there may be always nearly the 

 original proportion. 



Thirdlj, If it be inconvfenient to give the whole time of 

 boiling at once, the fire may be fuffered to go out and be re- 

 kindled at any diftance of time ; and if, in luch cafe, a fmall 

 proportion of pearl-aflies diflblved in water be added, and the 

 mixture feveral times ftirrcd betwixt the times of boilimr, it 

 will facilitate the operation.. The time of boiling may be 

 alfo much fliortened, if the Chalk, lime, and pearl-afhes, be 

 added for fome days before, and the mixture frequently ftirred , 



PROCESS THE FOtjRTH, 

 IV Inch may he praSlifed alone injiead of Procefs the FkJI, a^ 

 it will edulcorate and purify Fijh-Oil to a conjiderable De- 

 gree, fo as to anfwer mojl Purpofes, and for Procefs the 

 Thirds when the whole is performed. 



Take a gallon of crude ftinking oil, and put to it a pint 

 of water poured off from two ounces of lime flaked in the 

 air; let them fland together^ and fHr them up feveral times 

 for the fjrfl twenty-four hours ; then let them fland a day, 

 and the lime-water will fink below the oil, which muft be 

 carefully feparated from them. Take this oil, if not fuffi- 

 ciently purified for your purpofe, and treat it as direfted in 

 Procels the Third, diminifhihg the quantity of pearl-afhes to 

 one ounce, and omitting the lime and chalk. 



KOBERT DoSSIE*o 



XXI. On Painting. JBy Air. E. Dayes, Painter. 



Essay IX. 



On Stj'le. 



Nor, whilft I recommend the ftudying the art from artifts, can I he fup- 

 pofed to mean that nature is to be negkdted. Sir Jojhua RcjiioLis. 



A ERFECTION in painting requires that the choice, the 

 imitation and execution be dired^ed to the fame idea : this 

 only can produce a perfect unity in the whole work. It 

 will appear defeftive in proportion as it is deprived of a 

 union of thtfe qualities ; as that which pofTefles the fcwefl 



* The dregs remaining after the fundry proctlTes above mentioned wi'l 

 form an excellent manure, as has been fince noticed in Dr. Hunter's 

 Georgicnl £,ffays, 



I a faultj 



