HORjE ENTOMOLOGICAL 



PART II. 



CHAPTER I. 



INTRODUCTORY. 



In the former Essay it has been remarked as a subject of 

 regret to Entomologists, that the systems on which their 

 favourite science is pursued should be so far from natural ; 

 and that while the internal anatomy and exterior formation 

 of Insects have been studied with the utmost perseverance, 

 the important point of the connexion of these studies with 

 Physiology in general should have been altogether neg- 

 lected. It has also been observed that this neglect appears 

 the more extraordinary, as it is manifest that no natural 

 arrangement can be expected unless the anatomy of these 

 animals be considered with continual reference to their ha- 

 bits and manner of living; for the mere consideration of the 

 form and number of the various parts-composing the body 

 of an insect, can evidently lead to little else than artificial 

 divisions, if the uses for which these several parts were 

 intended be not also taken into account. Proceeding- 

 then on the plan of examining the structure of organs 

 with relation to their uses, I have attempted to disco- 

 ver the principal affinities which the insects comprised 



M 



