(T^A friend informi us that th« “fly1’ and joint worm are doing much damage to the wheat crop in the lower part of this county. We notice in our exchanges, that they have made their appearance in other parts of the state. We give below an account of the “fly” taken from an abstract of the seventh census.“In 1776, there was entailed upon this country an enduring calamity, in consequence of the introduction of the Hessian or wheat fly, which was supposed lo have been brought from Germany in some straw employed in the debarkation of Howe’s troops, on the west end of Long Island. From that point this insect gradually spread in various directions, at the rate of twenty or thirty miles a year, and the wheat of the entire regions of the Alle-Igbanies is now more or less infested with the lame, as well as in large portions of the States bordering on.the Ohio and Mississippi, and on the great lakes ; and so great have been the ravagrs of these insects that, the cultivation of this grain in many places, has been abandoned.”