Earths and Clays. 267 



hard, smooth, glossy, not colouring but marking a green line, 

 coppery taste, burns very hard and to a dusky brown ; from near 

 Rome, also near Woolwich : used as a lasting, but not bright 

 green paint. 



Argile de Saveignes. Blue, very tough, sandy ; used to 

 make the French poterie de gres, or stone ware. 



Argile des Forges-les-Eaux. Blue ; used to make glass- 

 house pots, and stone ware. 



Stourbridge clay. Dark grey, made into bricks for build- 

 ing glass-house furnaces, and also into crucibles for violent heats. 



Welsh clay. Used to make Welsh fire clumps for building 

 the fire-rooms of steam-engine furnaces. 



French chalk, Creta Brianzonica, C. Gallica, Morochtos, 

 LencoffCBu, Greenish, semitransparent, compact, smooth, unctu- 

 ous, glossy, not colouring, scrapes white, marks an unctuous silvery 

 line ; burns very hard and white ; astringent, used to mark woollen 

 cloth, to take out grease, and cause boots to slip on easily ; fre- 

 quently confounded with Spanish chalk. 



Myhsen, Meer schaum, Keffekil, Marga viridescens. Pale 

 greyish green resembling tallow dropped upon brass, close, heavy, 

 smooth, unctuous, glossy, not colouring, burning extremely hard 

 and pale white ; used as soap, and to make the large bowls of 

 German tobacco-pipes. 



Black chalk. Drawing slate ^ Pierre cPItalie, Crayon noire, 

 >rhi8tu8 pictorius. Fine black, compact, laminated, shghtly 

 inooth, colours and writes, burns white and friable, some burns 

 td ; in coal mines ; used as a crayon, 



KiLLOW, Nod du, Killoia molliuscula. Fine black with a 

 bluish cast, slightly smooth, friable, colours very much, tastes 

 astringent, burns hard and grey ; Wales : made into balls or 

 sticks, used in painting. 



Hard Killow, Marking stone. Common hlack chalk, Black 

 xhale^ Schistns carhonarins. Fine black, firm, slightly flaky, dusty, 

 • olouring, burns to a fine white soft ash ; used as a paint. 



Burst hartshorx, Comu ustum alhum, Cornu ustum. Burn 

 hartshorn until nearly white, grind, and wash. 



Spodium PRiEPASATUM. Bum Ivory, grind, and wash. 



Broom ashes, Cineres genistcs. From broom stalks burned, 

 (iiuretic, in dropsy. 



Daulakie earth. Used in India to make sherbet; contains 

 one-fifth of acidulous sulphate of iron. 



