SMITHSONIAN INSTITUTION 





Fig. 2.- 



-Clipperton Island landing. The island is an almost barren sand and 

 coral atoll, about 600 miles off the coast of Mexico. 



Fig. 3. — Xarborough Island from Tagus Cove, Galapagos. Characteristic of 

 most of the islands of the archipelago, it is composed of a central volcano whose 

 outpourings of lava have built up the island through the ages. 



