Mr. Foggo on an Insect found in the wood of' a Tabic. 85 



jf the lower grounds were as well watered as the higher 

 ones, they would be little inferior to them in fertility. 



At St. Helena the quantity of rain that falls seems to be 

 proportioned to the height, but in what ratio I could not as- 

 certain. At James's town very much less falls than at Plan- 

 tation house, and much seldomer at the former than at the 

 latter. Lime occurs in two places in the island. It was de- 

 scribed to be imbedded in the Lava Rock, and is an aggluti- 

 nated mass. I could not see a specimen of it ; but from what 

 I could learn, it is a saturated carbonate. 



Although it is said that no minerals occur in the island, yet 

 I found several specimens of lamelliform stilbite, and two or 

 three specimens of mesotype imbedded in lava, resembling 

 basalt. Near the landing place, and in my ride to Longwood, 

 I think I detected olivine and augite in a very compact lava. 

 I am not quite certain of this, as the crystals were very 

 small, and my examination of them hurried. 



We returned from our ride to James's town about two 

 o'clock ; and almost immediately after sunset weighed anchor, 

 and continued our course. 



Diana's Peak, the highest point of the island, is stated to be 



2692 feet above the level of the sea. The following heights 



I determined by the barometer : 



Height above the Sea. 



Cuckold's Point .... 2673 feet. 



Halley's Mount .... 2467 



Flag Staff ..... 2272 



Burn ... . . 2015 



Longwood ..... 1762 



Art. XIII. — Account of an Insect of the Genus Urocerus, 

 which came out of the Wood of a Table. By Mr. John 

 Foggo, Leith. Communicated by the Author. 



The insect I am about to describe is a species of Urocerus, 

 and is quite distinct from the U. gigas, the only British spe- 

 cies which has any resemblance to it. It protruded from a 

 folding table of fir veneered with mahogany. When the in- 

 sect was discovered, the table had been folded for some days; 

 and what first excited observation, was a large quantity of 



