388 
BOTANICAL GAZETTE [NOVEMBER 
than that of all the other islands combined. 
volcanic masses. 
It is composed of 5 
The northernmost, the Kohala Mountains, is of 
extreme antiquity, deeply eroded, and probably as old as Kauai. 
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flows. 
Fic. 1.—Island of Hawaii, showing high mountains and principal recent lava 
Mauna Kea and Hualalai, next toward the south, have become 
“extinct” within comparatively recent times; a lava flow issued 
from Hualalai in 1801. Mauna Kea has given no manifestations 
of activity within historic times. It is the highest point within 
the North Pacific Ocean. 
