ADVERTISEMENT 



TO 



THIS SIXTH EDITION. 



When the present work was originally published, 

 the Authors had no expectation that the demand for 

 it would be so extensive and permanent as it has 

 proved ; and they need not say how gratifying this 

 unlooked-for result has been to their feelings, as 

 realising their earnest hope of assisting to remove 

 the prejudices against the study of Entomology, 

 which existed in full force thirty years ago when 

 they took up the subject, but which have now hap- 

 pily 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 ex- 

 tending 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. 



A 2 



