Salts. 201 



It is not only found in the fea, fait lakes, 

 and many fait fprings in the proportion of 

 even 36 per cent, but alio in large mafTes 

 under the earth in many countries, as Poland^ 

 England, Tyrole, &c. alfo in coal and beds of 

 gypfum. Born's Index. Its colour is either 

 grey, red, blue, yellow or black. Cronjled 

 . 129. Born. 



SECTION XXII. 



Sal Ammoniac 



Requires about 3,5 times its weight of 

 water to diflblve it in the temperature of 60 ; 

 its fpecific gravity about 1,42 5 it makes 

 aqua regia when mixed with nitrous acid 

 it diflblves copper * it wholly evaporates 

 when laid on a hot iron. 



100 parts of it contain 52 of real acid, 40 

 of volatil alkali, and 8 of water. 



It is found native and of different colours, 

 grey, black, green, red, in the neighbour- 

 hood of volcanos, and in the mineral lakes 

 of Tufcany. 16 Roz. 362. Alfo in fome 

 mountains of Tartary and Thibet. 2 Linne 

 <von Gmelin. 335. and in the caverns or grottos 

 of PouzzolL Mem. Sued. 243. alfo in various 

 clays, though iu foiall quantity. Ibid. 



SPECIES XXIII, 



