OFEARTHS. 47 



in the mouth, pure, foft, and entirely free from grittinefs. In 

 water it raifes an ebullition with many bubbles, and a loud 

 hiding noife, but does not readily break and moulder in it to a 

 powder. It does not effervefce with Aquafortis. In the fire it ac- 

 quires a little additional hardnefs, and an elegant florid red 1 

 colour. Dr. Hill informs us, that he tried it as a paint, both 

 native as a yellow, and burnt as a red, and found it exceed all 

 the ochres the painters ufe in both thefe Hates. 



A light, friable, deep yellow ochre, the Ochre Attic of the 

 Antients (oj, is alfo found in concreted nodules with the former. 

 It is of a loofe plated texture, of a dufty furface, colours the 

 hands, and remarkably light and mattery, of a bright deep yel- 

 low, like that which faflron gives to water, fometimes lightly 

 fpotted with red. It adheres to the tongue, melts eafily in the 

 mouth, pure; and free from grittinefs. In water it makes a 

 great ebullition, but does not readily moulder away in it. It 

 does not effervefce with Aquafortis. In the fire it burns to a dufky 

 red, without any hardnefs. 



A heavy, friable yellow ochre (p) is frequently turned out 

 in detached pieces by the floods on the fouth fide of the brook at 

 Simonburn, with the geodes, and other flones and gravel. It is 

 of a fine flrong yellow when moift, and of a dufty dead yellow 

 when dry ; heavy, and of a clofe texture, foft to the touch, and 

 colouring the hands ; adheres firmly to the tongue, melts flowly 

 in the mouth, without grittinefs ; moulders or feparates flowly 



(o) Ocra crocei colons. Da Cofta. Hift. Foff. p. 98. No. 7. 



Ochra crocea laminata levis, qua: ochra. Attica Diofcoridis. Hill. Hift. Foff. p. 35. No. 5, 



(p) Ochra ponderofa flava friabilis. Hill. Hift. Foff. p. 54. No. 6. 

 Ochra Anglica. Merret. Pin. p. 218. Charlet. de Foff. p. 219. No. 5. 

 Woodw. Cat. A. a. 76. 77. et Cat. i. a. 29. 

 Ochra rufo-flava. Da Cofta. Hift. FofT. p. 100. No. 9. 



in 



