chap. iv. Hills of Phono lite. gj 



less regular shape, namely, Lot's Wife, and the Asses 

 Ears, composed of allied kinds of rock. From their 

 flattened shape, and their relative position to each 

 other, they are evidently connected on the same line of 

 fissure. It is, moreover, remarkable that this same 

 NE. and SW. line, joining Lot and Lot's Wife, if 

 prolonged, would intersect Flagstaff Hill, which, as 

 before stated, is crossed by numerous dikes running 

 in this direction, and which has a disturbed structure, 

 rendering it probable that a great body of once fluid 

 rock lies injected beneath it. 



In this same great valley there are several other 

 conical masses of injected rock (one, I observed, was 

 composed of compact greenstone), some of which are 

 not connected, as far as is apparent, with any line of 

 dike ; whilst others are obviously thus connected. Of 

 these dikes, three or four great lines stretch across the 

 valley in a NE. and SW. direction, parallel to that 

 one connecting the Asses' Ears, Lot's Wife, and pro- 

 bably Lot. The number of these masses of injected 

 rock is a remarkable feature in the geology of St. 

 Helena. Besides those just mentioned, and the hypo- 

 thetical one beneath Flagstaff Hill, there is Little 

 Stony-top and others, as I have reason to believe, at 

 the Man-and-Horse, and at High Hill. Most of these 

 masses, if not all of them, have been injected subse- 

 quently to the last volcanic eruptions from the central 

 crater. The formation of conical bosses of rock on 

 lines of fissure, the walls of which are in most cases 

 parallel, may probably be attributed to inequalities in 

 the tension, causing small transverse fissures ; and at 

 these points of intersection the edges of the strata 

 would naturally yield, and be easily turned upwards. 

 Finally, I may remark, that hills of phonolite every- 



