20 CONTROLLED NATURAL SELECTION 



knowledge of the subject is meagre, and prob- 

 ably untrustworthy. It may be that there 

 are pleasing scents, the purpose of which is to 

 attract enemies. 



One other method, by means of which 

 animals render themselves conspicuous, re- 

 mains to be considered, namely colour. This 

 has been left to the last, because it is the 

 most important and because a previous con- 

 sideration of the other methods may render 

 its consideration more comprehensible. This 

 is dealt with in the next chapter. 



