29 



and Lampadius has lately discovered it, in the iron sand of 

 Plohenstein, near Stolpen, in Saxony, and in that found 

 with the pyrope of Bohemia. Besides these, I have seen, in 

 the imperial cabinet, at Vienna, and some few private col- 

 lections, ores, said to come from Stiria or Carinthia, and 

 from Bohemia, in which the menac calx probably abounded; 

 as may be conjectured, from the strong shade of brown in 

 the colour, together with the considerable adamantine lustre, 

 both which are strongly characteristic of this genus. 



The use of this metal is, as will readily be supposed, from 

 its scarcity, and the newness of its discovery, very confined. 

 The rutile, indeed, was, for a length of time, employed to 

 give a brown colour, in the porcelain manufacture of Sevres, 

 near Paris; but, from the difficulty of communicating an 

 equal tint by it, has been since abandoned. The rock crystal, 

 inclosing capilUform crystals of rutile, has been employed 

 as a setting for rings. The precipitates, especially those from 

 acid of sugar, may be employed as water colours; that, by 

 acid of galls, affording a good tile red, and that, with Prus- 

 sian alkali, an agreeable dark green. The latter, also, com- 

 municates a durable colour to silk, as my friend, Lampa- 

 dius, assures me; perhaps, with proper management, it 

 might be employed to furnish the so much wished for du- 

 rable green for the printing of cotton. And, lastly, its close 

 connection with some iron ores, and those exactly of the 

 most superior quality, such as the ores of Norway and 

 Stiria, leads naturally to the suspicion, that it may possess 

 some favourable influence upon tlic manufacture of iron, 



and, 



