PREFACE. 



UPON completing the Translation of this < Manual,' it is 

 incumbent upon me to thank the press generally for the very 

 favourable reception it has obtained throughout its progress. It 

 was undertaken with the view to contribute to the advancement 

 of the study of Entomology, by giving a wider circulation to its 

 elementary principles ; and it is hoped that its interesting details 

 will tend to diffuse a taste for its more general cultivation. 



Amidst a multitude of original experiments and observations, 

 in addition to its numerous other scientific claims, this work will 

 be found to comprise, in its anatomical and physiological depart- 

 ments, a generalisation of the host of facts elicited by the laborious 

 investigations of Straus Durckheim, Miiller, Suckow, Leon 

 Dufour, Nitzsch, &c. &c., up to a very late period. It is 

 confidently believed, that a book combining the researches of 

 such eminent men must necessarily become extremely useful, 

 not only to the entomological but also to the physiological student, 



and to the scientific man in general. 



i 



The advantages to be derived from the study of natural 

 history are manifest. One of its most conspicuous merits, and 

 that upon which the immortal Cuvier particularly dwelt, is its 

 tendency to methodise the mind, by impressing it with a habit of 



