44 8 Second Appendix. IVIr. Voighton that of Franenberg ; and many others, in the dioceie of Fulda •, und Mr. de lä Fonda une mukitude de grands.pies courrones par des chauflees de bafakes en prilmes. Vol- cans El eint s, 327. To obviate this objeflio» recourfe bas been Fad to variocs fuppofitions grounded on*the an- tient revolutions of the globe, by which it is imagined theie hills vvere in part deflroyed, and only thofe parts left which fupport the bafaltic pillars; but is not this explaining a fa£l by a poffibility? \\ hat proof can be adduced, not of a refolution, for that is admitted, but that this revolution has changed the ftate of _thefe hills? Flow can this general agent be with~ any proba- Fjility applied to this particular cafe ? This is vvhat is required, otherwife a principle is aflumed that is the fubjcdt of debate; it were kränge that fuch convulfions as fhould rend mountains ihould leave the bafaltic pillars upright, and ftanding in their refpedive fockets, as thcfe do on the coalt of Antrim, , Another infuperable difficulty attendant on all the volcanic theories, but particularly this hvpo- tbefis, is, that bafalts ftand on or adjoin fub- ftances, which appear not to have fuffered in the Uightefl degree, or to have bccn at all eX- pofed to heat. Flow is it pofiible that fuch im- inenfe mafl'es fhould have been in a melting heat, for a confiderable time, and yet that the adjacent ftones, or earths, fhould not have been at all altered? All this, however, muft have happened if bafaltes were formed, asthe theory which I novv confider demands j for, it is found on limeflone un- decompofed ; on gneifs unaltered, on fandltonc 6 unmeked