On the Colours ohtained from the vietallic Oxides. iy 



the (liells were depofited, fince both are found in the fame 

 rocks. It muft have been brought thither by a dekige, as 

 no wood can at prefent grow there, as Don Ulloa alfo aitefts. 

 •The (hells are for the moft part bivalves, which geologilts 

 ■allow to form petrifaftions of the moft modern date. 



Laftly, La Feyroufe mentions that he difcovered marine 

 (hells on mount Perdu, the higheft of the Pyrenees, at the 

 height of nearly 10,000 feet. How he afcertained the height 

 is not mentioned : but that thefe fhells were depofited by the 

 -deluge is certain ; for at the fame height he found alfo the 

 -bones of land animals petrified. Journal des Mines, xxxvii. 

 P'.59j ^'^i ^^^ ^A' 



IIT. All F-Jfay on the Colours ohtainsd from the metallic 

 Oxides, and fixed by Fufion on different vitreous Bodies. 

 By Alexander Brogxiart, Diredor of the National 

 Manufa£lofy of Porcelain at Sevres, Engineer of Mines, &c. 



[Concluded from p. 348 of our laft volume.] 



A 



SMALL book, entitled L'Origijie de I' Art de la Pein- 

 iure fur Ferre, publiflied at Paris in i6(;3, and the Traite 

 de VArt de la Ferrerie*, by Neri and Kunckel, feem to be 

 the firll works that contain a pretty complete defcription of 

 the art of-painting on glafs. Thofe fince publifhcd, even the 

 large work of Leviel, which forms part of the arts and ma- 

 hufadtures of the academy, and what is faid in the Encyclo- 

 pcdie Mtthodique, are merely com.pilations from the two 

 preceding works. 



It is very remarkable, that if the procefTes defcribed in 

 thefe works were ftriillv followed, as we did in regard to 

 fome, it would never be poffible to form the colours for which 

 they pretend to give recipes. They only put the able artift 

 in the wav, but^hc muft always make amendments or addi- 

 tions. This was the cafe with C. Miraud, who has the 

 care of preparing the colours at the manuta(9:oiy of Sevres. 

 He was obliged, rather from his own knowledge man the in- 

 formation contained in the above books, to make the colours 

 employed for painting on glals. 



'I Ik; limits of a memoir will not allow me to enter into 

 liiftorical details rcfpc6ting the art of painting on glafs : a 

 full liitiory of it has been given in the work of Leviel above 

 mentioned. The matters and fluxes which enter into the 



• There is an Englifli tranfiation of this work entitled Neri'i Ail of 

 Gltif,. 

 Vol. XIV. No. 53. ii compofiilon 



