In the volcanic islands a distinction may be observed between the windward and leeward flanks, the moister windward slopes being the more richly clothed.
This is especially the case in the lower and moister regions, such as the west coast, where malarial fever is very prevalent and deadly; the most unfavourable factors being humidity with absence of climatic variation (daily or seasonal).
Broadly speaking, the climate on the north and west of the main ranges is both milder and moister than on the south and east, and accordingly the precipitation in the former is relatively heavier, namely IO to 20 in.
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