68 Transactions. 
Botanica! District -of the South Island of New Zealand (see map 4, p. 85), 
and to bring together the facts concerning their occurrence in the remain- 
ing parts of New Zealand and in the outlying islands which I have gathered 
from my own observations or are contained in various botanical papers 
in the Transactions of the New Zealand Institute and in other scientific 
publicaticns. 
The only really satisfactory meteorological data for use in such a study as 
the present one would be those recording the range in humidity in the forest- 
interior from day to day and from season to season, so that in this way a 
close comparison might be instituted between different types of forest and 
between different stations in the forest under varying conditions of climate 
and altitude, with a view to ascertaining both the minimum and the optimum 
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Map 1.—The New Zealand Biological Region. 
degree of humidity for each species. A large yearly rainfall might be 
found to characterize some locality which experiences an annual dry season, 
and under these conditions the filmy-fern flora would be scanty and local, 
there would be few epiphytes in the forest, and in a general way the forest- 
floor would be bare of all but the hardiest ferns. Even if there were 
no specially dry season in the year, extreme temporary fluctuations in 
the humidity—due, for example, to dry winds— would largely determine 
