378 "ALBATROSS" TROPICAL PACIFIC EXPEDITION. 



to the line of the slope of the volcanic mass, and have disappeared. The 

 sketch of the island of Saipan and others to the .south, as shown on the 

 Hydrographic Charts,* would indicate the existence of a number of terraced 

 islands. On leaving Rota we entered the field of the " Challenger's " 

 soundings, and, stopping all work, shaped our course for Yokohama, 



1 H. O. Chart 1748. 



