Observations on the Wheat- Moth. 125 



similar circumstances, must be determined by experi- 

 ments. 



Whether the stacking of grain influences the pro- 

 duction of the moth, I cannot say. In the centre of 

 large stacks, it frequently happens, that not a single 

 insect is to be seen. This, I believe, is more gene- 

 rally the case when the grain has been placed in large 

 and dark barns. On the, contrary, several instances 

 have happened (one of which came under my own ob- 

 servation), that while the middle of the mow was al- 

 most destroyed by the moths, the injury sustained 

 near its surface was, comparatively, very small. 



Upon examining the grain in the ear, after it has 

 been, for some time, in the stack, it rarely happens 

 that any thing preternatural can be seen. Stripping 

 off the grain, we, now and then, come across one, 

 the glume of which is perforated : the grain within 

 this glume appears perfectly solid, externally ; never- 

 theless, a larva, or worm, is, unquestionably, within. 



I cannot determine, whether the larva has, or has 

 not, any defined position in the grain ; but of one 

 thing I am certain, that it does not come out at any 

 one particular point. However, I believe, it more fre- 

 quently comes out from the small, or bristly, end, 

 than at any other place. 



Upon cutting open the grain, the larva may be ob- 

 served, from the size of the smallest pin-head (when 

 less than this, it can hardly be distinguished from 



