*)gg ON THE NATURE OF DRYING OILS. 



he went to France. It is as follows : — " Take four parts of 

 balfam of capivi and one of copal. Powder and fift the 

 copal ; and throw it by degrees into the balfam of capivi, 

 ftirring it well each time it is put in : I fay each time ; for the 

 powdered copal mud 'be put in by degrees, day after day, in 

 at lead, fifteen different parts. The veflel muft be clofo 

 flopped, and expofed to the heat of the fun, or a fimilar de- 

 gree of heat, during the whole time ; and when the whole is 

 reduced uniformly to the confidence of honey, add a quan- 

 tity of warm turpentine ; Chio turpentine is the befi. y> 



its durability Le Blond's prints were long neglected, and are now for-. 



an exce encc. g ^ eru Whatever difference of opinion may prevail refpect- 

 ing them, there can be none refpecling his varnifh, as I have 

 feen fome of thefe prints in perfect condition, notwithdanding 

 they had been thrown carelefsly about for nearly fixty years. 



His intelligence L e Blond was a pupil of Carlo Maratti. He died at a 



Italy. y r ver y advanced age, leaving behind him the character of an 

 ingenious projector. It is probable that he might collect 

 much information analogous to his purfuits during a long life ; 

 but it is more probable that he obtained much of it where he 

 received his education. Thus, wherever we find notices of 

 the ufe of thefe fubdances in the arts, they invariably lead us. 

 towards Italy, where they certainly were firil known. 



I have thus detailed the eircumftances which imprefs me 

 with a conviction that the vehicle I have offered to public 

 notice is, in fubftance, the fame as that ufed by the bed 

 colourids of the Italian fchools. What impreflion the facts I 

 have enumerated may make upon others I know not : but dill 

 the truth of my opinion mud be determined by experience ; 

 for it would be of fmall confequence to prove that this vehicle 

 was ufed in former times, unlefs it can likewife be madp 

 evident that it will be ufeful to the prefent race of artids. 



Yours, &c. 



TIMOTHY SHELDRAKE. 



Strand, February, 1801. 



VI.— 0/* 



