Mr, MarshAm'j Ohfervallom en the Infecls, &V. ' 24 \ 



added a leaping motion, frequently jumping full half an inch from 

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

 infects had poiTeffion appeared a little ilirunk. Befides thefe la*V* % 

 I frequently met with the T'hrips phyfapm running about between 

 the hulks, and alio feveral very fmall Ichncwmns^ one of which 

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

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

 pofited its eggs. This was feen alio by Mr. M'Leay, F.L.S. who 

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

 .Air. Long continued to fupply me with frelh ears every week ; and 

 alfo, at my requeft, tied fpmc gauze round feveral of the difeafed ears, 

 while growing in the field, which flood 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 hiftory 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 infect, to feveral of my friends who refide 

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

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

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

 vou will remember that you had obferved only the T'hrlps ph\faf>us y 

 which you concluded to have been the infect, if it was an infect 

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

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

 Wm. Mark wick, Efq. of Catsfield, near Battle, and the Rev. Wm. 

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

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

 lowing accounts. 



Mr. Markwick, in his letter of the 9th of Auguft, fays: u I re- 

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



Wz " and 



