VEGETATION TYPES. 
139 
ing it supplied by the soil). The latter are therefore scarce both in 
the poorest soils and in hammocks, and abundant in the high pine 
land, which is dry and practically devoid of humus. 
Some notes on the general geographical distribution of the 
species and their economic properties are added in a few cases; and 
one or more photographic illustrations of nearly every vegetation 
type are given. The order in which the different vegetation types 
is taken up is necessarily somewhat arbitrary, for they do not form 
a linear sequence, but are interrelated in a complex manner. Gen¬ 
erally speaking, however, the sparsest and most open vegetation is 
described first. 
In order to facilitate comparisons between different vegetation 
types, after the name of each species is put the numbers of the other 
types in which it occurs in sufficient abundance to be listed. Thus 
the species which have the most numbers are most widespread in the 
area, and those which have none are confined to one vegetation 
type, or nearly so. Some conclusions b'ased on these numbers are. 
given at the end of this paper. 
