ON THE NATURE OF DRYING OXlg. 259 



I In the firft volume of the Annales de Chimie, page 195, Prouft. 

 there is an imperfect (ketch of an analyfis of arfeniate of iron 

 by Mr. Prouft. 



In February, 1801, the Count de Bournon prefented to The ample ac- 

 the Royal Society a very long and able account of a great g 0unt de 

 number of varieties of thefe ores, which he had the good for- 

 tune to procure from Cornwall. This paper was followed by and Chenevix. 

 Mr. Chenevix's chemical analyfis, which proved the accuracy 

 of the Count's defcription. 



The molt extraordinary part of the paragraph in the French Extraordinary 

 Journal is a eonfeflion, that the fpecimen examined by Cit. attending this 

 Vauquelin had been fent to the Ecole des Mines of Paris by J u fM td n^ 8 ^ 

 the Count de Bournon. That gentleman never did fend any 

 until his account and Mr. Chenevix's had been made public. 

 Cit. Vauquelin's paper muft have been read at the National 

 Inflitute between September 20 and December 20, 1801, 

 fix months at leaft after the communication to the Royal 

 Society. Hence we fee the juftice of attributing that dif- 

 covery to the French chemift. 



In the Journal de Phyfique of Brumaire, tenth year, there Dr. Karften'f 

 is a paper of Dr. Karften, of Berlin, upon the fame fubject. : P a P eu 

 but which deferves no notice, further than as it regards the 

 hiftory of this fub fiance. 



lam, SIR, 



Your humble Servant, 



A CORRESPONDENT. 



V. 



On the Nature and Preparation of drying Oils ; zvith a View 

 to the Improvement of Juch as are ufed by Artifts, as Vehicles 

 for painting*- By Mr. Timothy Sheldrake. 



'JllXPRESSED oils, confidered with a view to the painter's Drying oils, and 

 life of them, may be divided into two kinds ; firfr, fuch as ££ as df n< * 

 **re capable of drying in fome circumftances by themfelves, 

 and always with certain additions ; and fecondly, fuch as 

 cannot be made to dry by any means whatever. 



# Tranfa&ions of the Society for the Encouragement of Arts, 

 for 1801, page 209. 



S2 Q£ 



