Sect. 111.] Mineralogy. 1 99 



tinder consideration. Among tliese arc AJagjiesia, 

 by lIofFman and Black ; Barytes, by Scheele and 

 Gahn ; StrontiteSy by Hope ; Silica, by Putt ; 

 Alumina, by Margraaf *; Adamanta, by Klaproth ; 

 and Jargonia, by the same great miiuTalogist. 

 Within this time, also, ten new metallic substances 

 have been discovered; viz. Cobalt, by Brandt, in 

 1733; Nickel, by Cronstedt, in 1751 ; Platina, by 

 Sch^ffer, in 1752; Manganese, by Scheele and 

 Gahn, in 1774; Tungsten, or Wolfram, by d'El- 

 huyart, in 1782; Molybdenum, by Hiehn, about 

 the same year; Uranium, by Klaproth, in 17^9; 

 Titanium, by the same philosopher, in 179-5; Tel- 

 lurium, or Sylvanite, also by the same, in 1797; 

 and Chromum, by Vauquelin, in 1798.— Beside 

 these, the discoveries belonging to almost every 

 class, order, and genus, in mineralogy, have been 

 ^lore numerous than our limits admit of recounting. 

 It follows as a natural consequence, from what 

 has been stated, that collections of minerals have 

 been more numerous, and more complete, durnig 

 the last century, than ever before. Among those 

 who have formed these collections, it is not easy to 

 select such as are most worthy of notice. In gene- 

 ral, the great systematic writers, whose names ha\ e 

 been mentioned, are entitled to the highest praise 

 in this respect also. The best collection now on 

 earth, if we may rely on the judgement of Mr. 

 Kirwan, from which fOw will presume to di^scn^ 

 is that made between the years 1782 and 17S7, 



* It is not meant to be asserted thnt siliceous and ar^iUaceoi,^ 

 earths were unknown previous to the time oi Pott and Margrant. 

 but that the discovery of their characters and properties, a. pure 

 cartlis, is to be attributed to thcbC mineralogists. 



