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INTRODUCTION. . i u me gcognoft, minerals of which the great mafs of the earth is com- pofed, with their various relations to each other, and thus paves the way for the inveftigation of the ftruc- ture an d numerous relations of thofe greater nvaffes of which the crufl of the globe is conftru&ed. To the metallurgist it affords the fure means of fe- T ? me ' parating the different ores, and thus prevents the nu- git roerous errors in the proceffes of fmelting, which are fo often committed by mixing with the pure ore diffe rent foreign and pernicious ores and foffils. ^ The miner, by an acquaintance with oryftognofie, TpAc is enabled to diflinguifh the various minerals he meets ''•th in his fubterraneous workings from one ano- 1 er, and to regulate oeconomically the labours of t ie feparatmg houfe, and the various operations of ltamping and waflting. f i m ' tnc ’ a logical chemist cannot make us acquaint- T ? thc "u Wl' h till* l i - , . ^ mmera. thofe - u which he has analyfed, or know^ld tnole he is about to fuhircf tn t, - • • l _ t L , , , J ett to his operations, without thorough knowledge of this branch of mineralogy. ^language will alfo enable him to defcribe his pro- ufts and edufts according to their colour, form, atte* 1 * ex ture, & c . which, although but little tnep C ’txr°’i 1S Un T lcftionabl y of the greateft import* miral f i aVC ° n ^ f ° rea ^ defcriptions of che- of thpV°r U S ^ lat ? * re ufuall y B* ven to be convinced nerHrt° ? efS d ,h ° lan 8 ua S e employed, and the y ° introducing into chemiflry the defcriptive kinguige of oryctognofie. lo thofe Who occupy themfelves with the deter-To,i,„ Wmatmn, value, and ufesofgems, ores, limeflones,™ i coals, ■slog chemi