SUGGESTED CAUSES OF MIMICRY 149 



total organism as well as in the rapidity of the 

 results achieved, the operation of Natural Selection 

 in the production of Mimicry is more than ordi- 

 narily akin to the methods of Artificial Selection. 

 Indeed a very fascinating and promising line 

 of investigation in a suitable locality would be 

 the attempt to initiate or improve a mimetic 

 likeness by means of Artificial Selection. 



Mimetic resemblances are of two kinds, re- 

 spectively interpreted by two well-known hypo- 

 theses, both based on the theory of Natural 

 Selection. 



1. Mimicry as interpreted by H. W. Bates 

 is an advantageous deceptive resemblance borne 

 by palatable or harmless species (the mimics) to 

 others that are unpalatable or otherwise specially 

 defended (the models). Such resemblance will 

 be spoken of as Batesian Mimicry, the examples 

 as Batesian mimics, the interpretation as the 

 Batesian Hypothesis. 



2. The resemblances between specially defended 

 species themselves, although well known to Bates, 

 were not explained by his hypothesis as he con- 

 ceived it. He suggested that they were an 

 expression of the common results produced by 

 forces common to the environment of the species 

 in question. Such likenesses ^ were subsequently 

 interpreted by Fritz MiiUer as the advantageous 

 adoption of a common advertisement by specially 



' It is probable that these -were the examples which Fi-itz 

 Muller had previously sought to explain by the theory of Sexual 

 Selection. See pp. 127-8 of the present volume. 



