When italics were used in the original book, the corresponding text has been surrounded by _underscores_; bold or larger characters (such as the large numbers in the index) have been surrounded by =equal signs=. Superscripted characters are preceded by ^. Mixed fractions have been displayed with a hyphen between whole number and fraction for clarity. When a fractional number has been used in a range (i.e. one and a half to two and a half), the dash separating the two numbers has been spaced (i.e. 1-1/2 - 2-1/2). [Illustration: Fruits with seedlings nearly ready to fall from the tree of Rhizophora mangle (shortest) and Rhizophora mucronata (longest). From Vanua Levu, Fiji. (1/4 of the true l…
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