Mr. Marsuam’s further Obfervations on the Wheat Infe. 227 
and to count the number of grains in each, in none I found fewer 
than forty, and in one fixty-two; nay, my fervant found one with | 
feventy grains, moft of which were perfeét, there being only three 
or four fhrivelled in each ear—a proof, I hope, that notwithftanding 
the depredations of this and other infects, the crop will not turn 
out deficient.”” In another part of his letter, Mr. Markwick, with 
great probability, conjectures, “ that thefe larve may feed on the 
farina, or male duft of the ftamina, and poffibly prevent the proper 
fertilization of the piftil in fuch a manner as to occafion the future 
grain to be fhrivelled and imperfect.” 
In addition to the foregoing remarks, I can only fubjoin a few 
obfervations of my own on the ears of wheat fent me by Mr. Mark- 
wick, and let Mr. Kirby’s accurate and valuable experiments follow 
as a feparate paper. On clofe examination of a number of ears, I 
found from two to fix grains inhabited by the larve, as reprefented 
in Tab. 22. fig. 10. a. in the 3d vol. of the Linnean Tran/fattions, ex- 
cept that the number of the larve was greater in many of them, 
and in one or two I found what appeared to be a-pupa. Having 
inclofed feveral of thofe ears in large phials, with gauze over the 
mouth, I foon perceived that they became covered with mould, and 
the larve quitting them fell to the bottom of the phials and perifhed. 
I then procured one of the chimnies made ufe of for Argand’s lamps, 
in which] inclofed fome other ears, covering each end with gauze: by 
this means a free circulation of air being permitted to pafs through, 
the corn remained clean, and the little animals have not quitted 
their fituation; which leads me to conclude that they will change into 
the pupa ftate, as many appeared to have done that were left in the 
box in which they came, fo that 1 have great hopes of breeding the 
fly at the proper feafon of the year, which I prefume is now approach~ 
ing. The figure from Mr. Markwick’s drawing, reprefented in 
Tab. xix. No.vi. fig. 2, agrees in general with the defcription of Zipu/a 
Gg2 Triticg 
