Natural History of the United States. 329 
We would add, that the great question whether man is of one 
pecies cannot in our view be decided adversely by science, until 
ine limits of variation and laws of variation in zoological spe- 
cles are fa* better understood than at the present time; not until 
we know why it is that so many species, and in some groups all 
the Species of those groups, vary little, while others undergo 
such diversities that naturalists have sometimes made a number 
of species and even genera out of a single species before the 
truth that there was but one among them was finally known— 
showing that the variations in one species may be equal to spe- 
that man is (1) of one species, (2) of one birthland, and (8) of 
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basis of this discussion—both the actual permanence of species 
Ree 
leaves the subject in his publications still an open one 
Pon the nature of individuals and species, 
st Speaking of individuals: 
“No one nor all f articular time, their 
: hem represent fully, at any particular time, 
— Pecies. tp, estar P tatives of the spe- 
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s which have gone before, and th 
not constitute the species, 
tity, as much as the genus, 
t continues to exist, while 
