cover a gun during our whole exploration, but the supply of 

 ammunition and the activity of the gunners gave plenty of evi- 

 dence that cannon were at hand when wanted. 



The altitude of the hills is not sufficient to cause the conden- 

 sation of much moisture from the trade winds, and therefore 

 Culebra is a dry island with no permanent streams or ponds. Its 

 •forest is low and not very dense, with guayanilla (Bucida buceras) 

 and lignum vitae as the largest and most valuable elements ; 

 much of the woodland has been cleared and the principal industry 



