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glafs : bears a greater heat than the diamond be- 

 fore it is confumed. Anal. Jargon earth 68. 

 Silex 31. Iron and nickel 5. Klaproth. 



I. SIDNEIJNEARTHMcoveredbyWedge- 

 wood ; it is contained in a compound fubflance from 

 Sidney Cove in South Wales; confiding of fine 

 white fand, fome colourlefs mica, a few black par- 

 ticles refembling black lead, and a white argilla- 

 ceous earth, and from which the new earth is ex- 

 tracted by the marine acid. 



a. Sidneia, amorphous, loofe. IVedgewood. 

 II. Mixed. 



A. CALCAREOUS. Calcareous earth, in 

 it's mo ft common ftate,is called limeftone, or fpar ; 

 it is in this ftate that it is combined with a peculiar 

 acid, expellabTe by heat, and hence called aerial 

 acid, fixed air, or carbonic acid ; it efFervefces 

 with acids in general: it's more mixed ftate is 

 now confidered. 



a. Marly Argillo-Calcite, femi-indurated or 

 earthy form, of a yellowiih grey, or yellowifh 

 white colour; loofe texture, ftrongly efFervefces 

 with acids ; in water foon falls into powder. In 

 a ftony or indurated ftate, fraclure earthy, fome- 

 times fplintery, or conchoidal, frequently flaty ; 

 colour various, yellow, grey,' brown or bluilh. 

 Anal. Carbonate of lime 60 to 80. Remainder 

 argill ; and filex. Kirwan. In it's ftony or in- 

 durated 



