THE TLY. 53 



again draw your attention for an instant to a remark- 

 able pecnliarity in its most important organs, one to 

 which we have already made passing allusions, namely, 

 to the repetition of similar component parts in the 

 structure of these organs. The eyes with their 

 facets, the antennse, wings, and halteres with their 

 numerous vesicles, and lastly, the pulvilli with the 

 appended suckers, all present examples of that pecu- 

 liarity of structure which has proved such a difficult 

 problem to naturalists; and although bundles of 

 nerves have been traced to the three sensory organs, 

 yet neither the searching powers of the microscope 

 nor a comparison of their structure in the various 

 races of insects, have enabled anatomists fuUy to 

 understand and estimate their true properties. A 

 closer examination of their habits, however, com- 

 bined with what is already ascertained in regard to 

 their anatomy, will doubtless soon clear up the 

 mystery; and should you be inclined to enter the 

 ranks of observers, you will find the field to be one of 

 unbounded study and interest. 



