43 8 Second Appendix. che realmente fono di volcanica origine But in the inferior of thefe bafalts notthe fmalleft pore appears. Of the opacity, dulnefs, and texture : or thefe ftones he takes no notice. As to the holes in the irregulär bafalts, it appears, from his ovvn account, that they pfoceed from the decompofition of other ftones, that were pre- viouily coniained in them. That many of them dbntain clay, fieatues, er zcolyte, is an evident proof that they are not volcanic * for, the fire that could nicit tt^eni would evidently harden the fteatites. harden or melr the brown clay, and certainiy melt the zeolytes, vvuich are nc>t even deprived of tlieir water of cryfhdlization. Mr. Voight, a zealous ftiekler for the fufion of bafalt, anfwering this objeeTcn, contents himfeif with faying tnat many baf.ts are fotind net entire^y de- ßitute of pores f; admitting thereby, that many, if not mß, are free from them; and that thofe that have any Lave but few. Now, if any be deftitute of them, we cunnot hold them for real lavas, and thofe that have auy (fince they are all of the ferne origin) n.uft derive them from fomc other caufc than tue ejpuhion of air hy fire. 2d, Mr. Dolor - eu anfvvers this objecüon by allo-ymg it to be truc in every to!.:t 0/ viev:. and infilbng ihat the igneor . orig r of bafalt can be prov-d folcly by loc cirtumftances. In his Notes or. Bergman, p. e,0 ho tel’ us, “ lt is ** very true the lavas of p r ilfnatic olumn-», and “ all other comprtfr lavas, prefervc no appear- “ ance whatever of fuiiou, v-m.r. coid, becaufe “ lavas are not vimfadtions ; volcanic fire doys * On 3 Pergüi. De I’rAdotti Volc~.11. 18$. ■j- Mineruiogifch and IJetgm. Abhand. 171. “ not