{ 299 ) 



one body with them. They may, alio, pof- 

 fibly be I'mall fragments of a very ancient 

 lava, with a bafe of fhoerl in the mafs ; un- 

 lefs we rather choofe to fappofe that fome 

 vein of flioerl, broken by the impetuofity of 

 the elaftic gafes, and reduced to minute 

 pieces by the fhock, has been thrown out 

 from a volcanic mouth, without having been 

 fufed or changed by the fire. 



VII and lall Lava. Though this be fpe- 

 cifically the fame with No. II, it claims to 

 be diftindly mentioned from the manner of 

 its conformation. About half way up one 

 of the fummits of the mountain, there is an 

 overhanging precipice, from which go ofF 

 two ranges of prlfmatic columns ; the one 

 higher than the other, but both nearly ver- 

 tical. Their height differs from thofe of 

 one foot to thofe of three. When we confi- 

 der the precipice, or rent in the mountain 

 to which they adhere, and the circumference 

 of it, we perceive, that, when it was entire, 

 they extended to but a little diftance from 

 their central point. The bafe of this column 

 6 is 



