III.] INDEPENDENT SIMILARITIES OF STRUCTURE. 107 



it is hoped, amply sufficient to point toward the conclusion 

 which other facts will, it is thought, establish, viz., that 



HOBXED FLIES. 



there are causes operating (in the evocation of these har- 

 monious diverging resemblances) other than "Natural Se- 



-. -^*. - 



TIIC MAGNIFICENT BIRD OF PARADISE. 



lection," or heredity, and other even than merely geograph- 

 ical, climatal, or any simply external conditions. 



