[ 6s ] 



ivhofe detail we are unacquainted. Now this happens to be 

 the cafe with refpedt to the folution of earths or ftones of the 

 fihceous kind.. Mr. Bergman had already obferved that filiceous 

 earth, fufficiently divided, was foluble in all acids *. Mr. 

 Klaproth, the worthy fuccefTor of the immortal Scheele, 

 found it foluble in mere water in the fame ftate of diviiion f . 

 The great geologift, Mr. Dolomieu, feems to have difcovered, 

 by the help of the chymical abilities of Mr. Pelletier, the 

 very circumftances on which its folubility depends. Mr. 

 Morveau has alfo difcovered another, and a very different method 

 of effeding this folution X- Mr. Laffone foimd the furface 

 of grit, which had been broken a year before, invefled with 

 filiceous crufl nearly as hard as agate, which therefore m.ufl 

 have been newly formed. Hence ftrata might be confolidated 

 without fufion §. It were cafy, but needlefs, to accumulate 

 more teftimonies of this fadt, as other proofs of fuch produdtion 

 will occur in the fequel. Dolomieu obferved the growth of 

 fhorls on the Pyrenees [J. 



Our author next proceeds to ftate, " That if it is by means 



" of heat and fufion that the loofe and porous ftrudlure of the 



" ftrata fliall be fuppofed to have been confolidated, then 



" every difficulty which had occurred on the power and agency 



Vol. V. I « of 



* 5 Bergm. 128, in Note. 



f 3 Berl. Beobacht. 160. 



$ Swed. Abhandl. 1790. 



§ Mem. Paris, 1774. 13 in 8vo. 



II Surlea Ifles Pouces. 249. 



