146 APPENDIX. 



(3.) As far as regards the destroyers of the insect, I should be glad 

 also to be constantly informed of the progress of the lady-birds 

 and ichneumons ; and also, when the insects greatly abound, to 

 have accounts transmitted of the actual number of insects con- 

 tained in the crops of various birds. 



(4.) I should like also to know whenever mischief appears to arise 

 from the use of damaged potatoes by cattle or by man. 



(5.) Should any other Aphis appear in any quantity, I should be 

 pleased to receive specimens, as one Aphis in excess is apt also 

 to be attended with a larger development of other Aphides 



(6.) If by any chance this work should fall into the hands of 

 foreigners, I should also feel under great obligations if they would 

 favor me with similar returns. 



If these returns are made to a considerable extent from all counties 

 of England, and I should not lose as much money by the publica- 

 tion of this work as usually happens to the lot of scientific writers, 

 I propose to make this Treatise expansive, by publishing con- 

 tinual Supplements, as occasion may require. The above tabular 

 return is wanted directly ; and, therefore, I solicit newspapers 

 and magazines, the present great organs of knowledge, to copy it, 

 that it may be immediately prepared. 



In case these returns should be sent in any great num. 

 bers, I beg that the letters may be endorsed on the enve- 

 lope, " Public," that I may open them at my conveni- 

 ence. 



It has happened on former occasions that I have been 

 unable to answer the various questions upon public sub- 

 jects submitted to me, from my time being occupied with 

 subjects which absolutely demand my prior attention. For 

 all these omissions I hope the writers will excuse me, as, 

 whenever my occupation would permit, I have rendered 

 the information required to the best of my power. 



