J. D, Dana on the Origin of Prairies. 295 
There is scarcely a day without low and heavy clouds about the 
summits of the mountains. Many streams of moderate size flow 
ered with grass;” “the forest vegetation descends lower on the 
eastern declivities because they are well supplied with moisture 
from the trade winds—the rain of the southeastern side of Viti 
4 
; 
1a ee 2 
Lebu at least trebling that of the opposite side. 
ae The rocks at the Navigators and the Feejees are of volcanic 
> 9r igneous origin, like those of Tahiti, and similar to the latter 
hills, above one or two thousand feet in elevation, are largely = 
forest-covered ; for these, owing to their np, Sa and coolness, 2a 
_ Condense some of the moisture remaining in the sea-winds, and 
with the age below, a moist soil, and the 
ther east, beyond the Caseade Rang ins, ; eae 
: of the gigas is more extreme, and the forests fail altogether 
__* Exploring Expedition Geological Report by the Author. (sto. 1849), p- 514 
-* For details ce same Heport, and also this Journal, [2], vik 387-908, 1840. 
