1893.] D. Prain — Flora of Navcondam and Barren Island. 



51 



(a submarine peak that reaches the surface, but no more, in Lat. 11° 12' 

 N. and Lon. 93° 36' E.), and 320 miles due west of Mergui. As shown 

 in the subjoined table, the island, like ISTarcondam, rises abruptly out 

 of deep water, especially on its eastern, western and northern sides, to 

 a height of 8000 feet or more* above the floor of the Andaman Sea. 



Table II.- 



-Soundings in tlie vicinity of 



Barren Island. 



General direction 

 line of soundings 



OF 



Distance in miles from 

 central cone. 



Depth 



OF SOUNDING IN 

 FATHOMS. 



E. S. E. 

 E. S. E. 

 E. S. E. 

 E. S. E. 



li (i mile from shore). 

 2i 

 3i 

 100 



118 



433 



641 



1260 



N. N. E. 

 N. N. E. 

 N. N. E. 



li (i mile from shore). 



2i 



31 



217 



545 



782 



N. 

 N. 



It 

 25| 



325 

 1,140 



W. N. W. 

 W. N. W. 

 W. N. W. 

 W. N. W. 



li (! mile from shore). 

 2i 



45 



180 



456 



655 



1159 



W. 

 W. 



1 3 



30 



169 

 1130 



S. S. W. 

 S. S. W. 

 S. S. W. 



If (| mile from shore). 



3i 



4* 



47 

 238 

 413 



Physiographical accounts of this island have been given by Ballf 

 and MalletJ in whose papers a precis of previous information is also 

 contained ; a brief description is therefore all that is here necessary. 



Nearly circular in outline and about two miles in diameter, the island 

 consists of a huge crater, of which the mouth is a mile wide and 

 the rim is from three-quarters of a mile thick at the base — throughout 

 its southern half, where it is from 920 to 1160 feet high — to barely half- 

 a-mile thick — along the north where its height is from 630 to 790 

 feet. The rim is further breached to below sea-level on the west side 

 by a part of the original hill having been at one time blown away, the 

 resulting gap being about a-quarter of a mile wide. In the middle of 



* Mallet and Carpenter : Records of the Geol. Survey of India, xx, 46, (footnote), 



t Ball : Records of the Geol. Survey of India, vi, 81. 



X Mallet : Memoirs of the Geol, Survey of India, 251, et. seq. 



