Mf. Marsiiam'j Olfervatiom en the Infers, ^c. 24; 



nddecl a leaping motion, frequently jumping full half an inch fu>:n 

 the paper on which I examined them. The grain where thefc 

 infeds hadpofTefTion appeared a little ihrunk. Befidcs thefc lurViS, 

 I frequently met with the Thrips phyfapus running about between 

 the huiks, and alfo feveral very fraall Ichneumons, one of which 

 fettled upon a larva while under my glafs ; and 1 faw it repeatedly- 

 wound the little maggot with its tube, and I have no doubt it de- 

 pofited its eggs. This was {tzw alfo by Mr. M'Leay, F.L.S. who 

 was examining them with me. — I placed this wheat in water, and' 

 Mr. Long continued to fupply me with frelli ears every week ; and 

 alfo, at my rcqucft, tied fome gauze round feveral of the difeafed ears, 

 while growing in the field, which ftood until the corn was ripe ; 

 but I was not able, with all my care, to difcover the fly produced 

 from the before- mentioned larva. Anxious, however, to determine, 

 if poflible, the hiltory and progrefs of this little animal, which now 

 feemed to create univerfal alarm ; and knowing that my various 

 avocations would prevent my quitting London ; I had written, on 

 the firfl hearing of the infeft, to feveral of my friends who refide 

 in the country, and to you among the reft, requefting their parti- 

 cular attention to this fubjedt, and the refult of that application I 

 now give you. — From the obfervations you were enabled to make, 

 you will remember that you had obferved only the 'Thrips phyfapus, 

 which you concluded to have been the infedt, if it was an infe»5l 

 which did the mifchief, although you could not difcover any ma- 

 terial injury that had occurred. — From our truly valuable friends 

 Wm. Markwick, Efq. of Catsfield, near Battle, and the Rev. Wm. 

 Kirby, of Barham, of whofe accuracy and attention to this fubjed 

 we have both received very convincing proofs, I received the fol- 

 lowing accounts. 



Mr. Markwick, in his letter of the 9th of AugufI:, fays: " I rc- 

 " paired immediately to my wheat fields on receiving your letter, 



I i 2 " and 



