44 O F A R T H S. 



ters, and makes a red little inferior to the Indian red earth. This 

 here defcribed was taken out of the cavity of a large free-flone. 



An indurated deep red ochre, the Rubrlca duriufcula, the harder 

 reddle, or red chalk of authors (k} t is dug among the fea-rocks 

 at Bednel. It is heavy, of a firm, compact, and even texture ; of 

 a fmooth furface, and fomewhat unctuous ; flams the hands 

 extremely much ; melts freely in the mouth, of an aflringent 

 tafte, pure, and free from grittinefs ; makes no ebullition in. 

 water, and with difficulty diffufes or moulders to pieces in it. It 

 does not effervefce with Aquafortis. In the fire it acquires an addi- 

 tional hardnefs, and a darker colour. 



It is highly valued by painters and other artificers for its fine co- 

 lour. It is faid to make excellent crayons, but not to mix with oil 

 fit for painting. In medicine, it is of great ufe among the Germans. 

 They ufe it for the fame intentions as the Hematites, in all kinds 

 of fluxes, as hemorrhages, dyfenteries, 8cc. with fuccefs. It is 

 faid to have been the chief ingredient in the famous powder of 

 Dr. Lehman, phyfician to the Elector of Saxony. 



A friable, heavy, flprid red ochre is dug among the fame rocks, 

 It is of a friable uneven texture j of a rough and dufty furface ; 

 crumbles eafily between the fingers, and ftains them very much. 

 It melts freely in the mouth, of an aflringent tafte, and gritty. 

 In water it makes an ebullition with a hifling noife, and inftantly 



(k) Greta rubra. Da Cofta. Nat. Hift. Foff. p. 86. No. i. 

 Rubrica duriufcula. Woodw. Meth. of Foff. p. 3. No. 10. 

 Catal. of Fofl". i. a. 39, et 40. 



Rubrica fabrilis. Merret. Pin. p. 218. Charlet. de Fofl". p. 219. No. 3. Dale's Pharm. 

 p. 23. No. 5. 



Marga ochracea rubra, Rubrica fabrilis vulgo. Linn. Syft. Nat. p. 204. No. 2. 



Ochra argillacea indurata rubra, quseCreta rubra Authorum. Hill. Hift. FoflT. p. 62. No. 12. 



moulders 



