266 



ISLAND LIFE. 



[part it. 



irregular shape, while the four next in importance — Chatham, 

 Indefatigable, James, and Narborough Islands, are each about 

 twenty-five or thirty miles long, and of a rounded or elongate 

 form. The whole are entirely volcanic, and in -the western 

 islands there are numerous active volcanoes. Unlike . the other 



MAP OF THE GALAPAGOS AND ADJACENT COASTS OF SOUTH AMERICA. 



The light tint shows where the sea is less than 1,000 fathoms deep. 

 The figures show the depth in fathoms, 



groups of islands we have been considering, these are situated 

 in a comparatively calm sea, where storms are of rare occurrence 

 and even strong winds almost unknown. They are traversed by 

 ocean currents which are strong and constant,,^ flowing towards 



