422 



GENERAL BIOLOGY 



CONCLUDING WORK. 



As a conclusion to the foregoing studies, make a tabular 

 statement of the adaptive structures observed (a few are 

 stated, as examples) after the following plan: 



Special adaptations of diving beetles. 



The record of this and the consummation of several 

 preceding studies will appear in the last table. 



j. Animal coloration. 



We come now to the examination of characters that are 

 more superficial, more variable, more plastic, and that 

 ordinarily show the most remarkable fitness to environ- 

 ment. We pass by all that internal coloration, however 

 brilliant, that can have no relation to the external world, 

 because hidden from view; such as the red of blood, the yel- 

 low of fat, the iridescent tints of the swim-bladder of fishes, 



