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THIS SIXTH EDITION. 



When the present work was originally published, the Authors 

 had no expectation that the demand for it would be so exten- 

 sive and permanent as it has proved ; and they need not say 

 how gratifying this unlooked-for result has been to their feelings, 

 as realizing their earnest hope of assisting to remove the preju- 

 dices against the study of Entomology, which existed in full 

 force thirty years ago when they took up the subject, but which 

 have now happily disappeared. 



Though, however, a regular annual demand for a certain 

 number of copies has always continued up to the present time, 

 so as to have exhausted the last edition, the publishers have 

 suggested that the future sale of the work, and its main object 

 — that of extending the knowledge of insects — would be much 

 forwarded, if the first two volumes, treating of their manners 

 and economy, were published separately, so as to obviate the 

 necessity to those who do not care to pursue the study farther, 

 of being burdened with the heavy cost of two additional volumes 

 of matter, chiefly technical, in which they feel no interest. 



It is in compliance with this suggestion that these volumes 

 now appear as a distinct work, and (though greatly enlarged 

 by new matter) at a considerable reduction of price ; but at 

 the same time it is hoped that a new edition of the two 

 remaining volumes will follow at a future period, when they 

 will be also given as a distinct work, comprising the anatomy, 

 physiology, orismology, &c. of the science. 



