With regard to the Hessian-fly, even if its presence could be ascertained in the early stages, it does not seem possible to devise any means of destroying the eggs or young larvæ, unless feeding off the blade with sheep would effect the object; and when their progress is detected by their mischievous works, at a more advanced period, nothing, I apprehend, but sacrificing the crop would arrest them. It appears, therefore, to be an evil to which we must occasionally submit; but, to guard against its immediate recurrence, it will only be necessary to collect and burn the stubble after the corn is reaped, by which means the larvæ and pupæ which are concealed at the base of the stalk will, of course, be destroyed. Now, in reference to wheat stubbles, we would remark that the old-fashioned plan of leaving them long as a protection, and, we may add, a preserve of food for partridges, had its good effects in an agricultural point of view; but if this be done, we advocate the burning of the stubs on the soil, as they will thus act better as a manure, while the destruction of insects by the process must be enormous. All concur that modern agriculture suffers increasingly from insects; hence, then, an extended study of their habits seems daily more desirable: and we boldly assert that if our country schoolmasters would teach their pupils to observe insect life, they may be doing more good to agriculture than all our present so-called agricultural colleges and schools put together. 4. The _Aphis flea_ (_Aphis granaria_) is a creature destructive to the grain by “sucking the verdure out on’t.” We have this year (1864) seen this insect, more especially the _apterous_—wingless—females, sticking on to the green wheat ears to such an extent as to render a walk into the crop a disgustingly dirty process. It would seem that a continuous dry and warm season favours the increase of these creatures; but, as we have always observed that the earlier sown wheats nearly always escape, from their coming into ear and advancing to ripeness before the aphis has increased its countless broods; so then we should recommend early wheat sowing, wherever and whenever practicable, as a preventive of the pest; in fact, the being in good time with all farm work has every advantage.