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solution of the problem is to be found in the fact that 
these species inhabit the same localities, are exposed to 
the same special conditions of climate, feed on the same 
plants, live the same life, and so are transformed into the 
same outward semblance by the same external conditions. 
Bearing this fact in mind, it is interesting to observe what 
the first condition of the theory of mimicry is. 
“ The first law is that in an overwhelming majority of cases of 
mimicry, the animals, or the groups which resemble each other, 
inhabit the same country, the same district, and, in most cases, are 
to be found together on the very same spot.’'—(Wallace. Contribu 
tions. ftp. 76-7.) 
In other words, the two species are placed under those 
conditions in which the transformation in other cases takes 
place apart from Natural Selection. If the transformation 
is the same in both cases, all the similar organisms will 
be modified by similar conditions in the same way, and 
there will be no room for the slow process of the selec 
tion of birth-variations. The first law of the production 
of mimicry by Natural Selection would thus at once pre 
vent the development of mimicry by Natural Selection. 
The idea that true mimicry has the same source as false 
mimicry is confirmed by the fact that when the locality 
is changed the models undergo a change, and the mimics 
follow suit, if indeed they do not change simultaneously. 
The theory accounts for the mimicry of the imitators ; 
but it does not account for the change in the models. 
This is not due to Natural Selection. It must be due to 
other causes. But if the models are changed by other 
influences, why not the so-called mimics ? 
We have already dwelt upon the fact that the process 
of producing resemblance between different species by 
Natural Selection is represented as very easy on the one 
hand and very difficult on the other. In this connection I