41 



mummies, the paintings on glass, the perpetual 

 Jamps, &c. not to mention that there are now many 

 secrets practised in different nations, and unknown 

 111 others, such as the Russian way of preparing lea- 

 ther, that of the Turks in tempering steel, that of 

 the Chinese in making porcelain, the lacquer of the 

 Japanese, and the dye of Gobelins, 



