ADVERTISEMENT 



TO 



THE 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 grati- 

 fying 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 happily 

 disappeared. 



Though, however, a regular annual demand for a certain num- 

 ber 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 tech- 

 nical, in which they feel no interest. 



