81 



His comment, upon this specimen, I shall also give, ia 

 his own words. 



" L'on voit dans cette echantillon, des farties, ou la lave 

 " est encore basaltique; tandis que le reste est entierement chan- 

 " gie par taction du feu, en lave poreuse. — Le passage du ha- 

 " salte, et de la lave compacte, a I'etat de lave poreuse, est 

 " ici fait par gradation." 



I suspect this specimen of JNIr. St. Fond, to be similar 

 to the one, found by Mr. Whitehurst, at the Giant's 

 Causeway, among the fragments of lava, as he calls our 

 rubble, " a piece of iron ore, vitrified on one side : Avhich 

 " is some testimony, that the substances, supposed to be 

 " lava, have, also, been in a state of fusion.'' 



This must have been a paltry volcano of Mr. AVhite- 

 hurst's, that could vitrify but one side of this fragment. 



Dr. Troil, too, found, on the shor6, in one of the wes- 

 tern islands of Scotland, a fragment, as he says, " exte- 

 *' riorly, full of holes, and, in a manner, burnt. " This he 

 sent, in great triumph, to Sir Torbern Bergman, as a 

 proof, that volcanos had once burnt in these islands. 



Had either of these gentlemen looked around them, 

 they would soon have found the craters, in which their 

 respective specimens had been acted upon, to wit, the 

 ruins of kelp-kilns, with which the shores in both coun- 

 tries abound. Upon the walls of these, the fire produces 

 ihe same effect on the basalt, of which they are built, as 

 the same agent does, at Mr. St. Fond's lime-kilns. 



An 



