E^g ObfefVations on Naples Yellow, 



tao-eous to his empire, nor exclude his own fubje&s from it. 



Before this can be done, the 1 urkey Company muft be 



abolifhed. 



At prefcnt a few goods, I am informed, have been fent 

 to Hamburgh, thence to Vienna, and down the Danube, 

 where they are {hipped for Conftantinople. The freight to 

 Hamburgh is dearer than it is to Riga ; the charges acrofs 

 Germany ten times as much as acrofs Paiffia. At the 

 mouth of the Danube there are only bad Turkifh or Greek 

 veflels to be freighted, on which no regular infurance can be 

 made. At Cherfon there are fome hundreds of veflels, 

 among which many equal thofe to be found in the ports of 

 other feas, and a reafonable infurance may be made on 

 them by fafe underwriters ; but the route through Germany 

 does not neceffitate an abolition of the Levant Company. 



VIII. Obfervations on Naples Yello-iv, and the different Me- 

 thods of preparing it. By Profe/JbrREC km ANN. 



_£N APLES yellow, which is alfo called Neapolitan earth, in 

 Italian Giallolino, and in French Jaime de Naples, has the 

 appearance of an earth, is of a pale orange-yellow colour, 

 ponderous, granulated, exceedingly friable, does not efflo- 

 refce, nor become moid when expofed to the air, but when 

 applied to the tongue feems to adhere to it. When reduced 

 to a fine powder, it remains for fome time fufpended in wa- 

 ter, but foon depofits itfelf at the bottom in the form of a 

 (lime. When boiled with water, the water, at leaft fome- 

 times, is obferved to have a fomeuhat faline taite. It does 

 not effervefce with acids, but is in part diflblved by aqua- 

 regia {iiitro-muriatic acid). In the fire it emits no fulphureous 

 vapour, is difficult to be fufed, and by that operation under- 

 goes no material change, only that its colour becomes fome- 

 what redder. When fufed with colourlefs glafs, it gives it a 



milk- 



