soo A SYSTEM OF 



a. With a calcareous earth, White fpa- 

 thofe iron ore. The Stahlftein of the 

 Germans. See Sect. xxx. 



£. With a filiceous earth. The Martial 

 Jafper or Sinople. Sec~t. lxv. 



r. With a garnet earth. Garnet and coc- 

 kle or fhirl. Se€t. lxix. ' 



d. With an argillaceous earth. The bole. 

 Se€t. Ixxxvi. 



e. With a micaceous earth. Mica. Setft. 

 xcv. 



/. With rnanganefe. Se<5t. cxvi. 



SECT. CCVIII. 



g 9 With an alcali and phlogifton, Calx 

 martialis phlogifto juntla, et alcali precis 

 pitata, Blue martial earth. Native Pruf- 

 fian-like blue. 



I. Loofe or powdry, found among the 

 turf in the levels of the province of 

 Skone : Alfo in Sax WeifTenfels, and 

 at Norvlanden in Norway, &c. 



SECT. CCIX. 



b. With an unknown earth, which hardens 

 in water, Calx martis terra incognita* 

 aqua indurefcente mixta, Tarras, Ce- 

 ment um. 



1 . Loofe or granulated, 'Terra Puzzolana, 

 from Naples and Civita Vecchia in 

 Italy. This is of a reddifh brown 

 colour, is rich in iron, and is pretty 

 fufible. 



2. Indurated, Cementum induration, from 

 Cologne, 



This 



