ii.] GENERAL CONCLUSION. 67 



offer a large field for study ; nevertheless I venture to 

 think the evidence now brought forward, however 

 imperfectly, is at least sufficient to justify the con- 

 clusion that there is not a hair or a line, not a spot 

 or a color, for which there is not a reason, which has 

 not a purpose or a meaning in the economy of nature. 



K 2 



