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 SOOTH 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 
