VIII NA RARO 127 



subaerial vent. Na Raro has shared in all the later stages of the 

 submergence and emergence of the island. Though it presents 

 the final page in the history of the hornblende-andesite volcanoes, 

 that chapter has been for unknown ages closed. 



The Na Raro Gap. — Between the Tavia and Va-lili Ranges 

 there is a break in the mountainous backbone of the island, to 

 which I have given this name. The greatest elevation is probably 

 not over 800 feet. It is from the south side of this watershed that 

 the Lango-lango river takes its rise. 



