Analjfts. 459 THIRD APPENDIX. Of the Chemical Analyfis of Earths and Stones. Tpl IS fubjeft, treated in its full extent, would require a particular account of the mari ner of analvzing not only each particular genus, but alfo moft of the various fpecies contained un- der thofe genera; it is eafy to fee this would re quire an immenfedetail; my intention, therefore, is to conlider thefe foffils abftra&edly from all external charadters, and lolely in their relation to Chemical agents, particularly to fpiric of nitre, and the vitriolic acid. In this point of vicw they may be divided into feven clalles : ift, Thofe that are wholly or partially folu- ble, and with effervefcence, in nitrous acid, whofe fpecific gravity is i,4> or higher. ad, Thofe that are infoluble in nitrous acid 1,4, but wholly or partially foluble, and with effervefcence, in nitrous acid 1,25» * n tem pc* rature of 6o°. 3d, Thofe that,are infoluble in fpirit of nitre or nitrous acid 1,25, but totally or partially fo luble,