26 
THE ENTOMOLOGIST’S WEEKLY INTELLIGENCER. 
and, after giving', as we have already 
quoted, a definition of what is ordinarily 
meant by the terra “species,” he pro- 
ceeds to give his own definition of what 
he intends by that word. “ The whole 
of the individual specimens which re- 
semble each other sufficiently to make 
us conclude that they are all, or may 
have been all, descended from a common 
parent. Their variations would he such 
only as we observe among individuals, 
which we know or believe to have had 
such a common descent. The specific 
identity of two or move individuals 
admits, therefore, but very rarely of 
positive proof; we must judge of it by 
inductive evidence, selecting by the 
careful consideration of what characters 
are known, especially in allied species, 
to remain permanent generation after 
generation, unaltered by change of soil, 
climate, or other circumstances, and 
what are the variations occasioned by 
causes which we can appreciate, or 
which are known to occur without 
assignable cause. The conclusions to 
be derived from such evidence will not 
indeed always be decisive, and diflferent 
persons will often form different judg- 
ments ; but that is an unavoidable con- 
sequence of the imperfection of the 
human mind,” or, we should rather 
say it is another instance that “ in 
nature no two individuals are exactly 
alike in every respect.” 
The Entomologist’s Weekly Iniel- 
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