Before the war, the Loudoun Heights used to be the favorite roosting place of immense numbers of crows that, during the autumn and winter foraged all over the Shenandoah Valley and all the rich grain lands east of the Blue Ridge, as, also, Middletown Valley and the proverbially fertile region between the Catoctin and the Patapsco. About an hour before sunset, advance bodies of the vast army would appear from every direction and, before daylight had died out, it is no exaggeration to say, the whole sky was obliterated from view by myriads upon myriads of the sable freebooters. For some reason best known to themselves, these birds do not, at once, settle down to rest, on arriving at their encampments, but wheel and circle 'round, as if none of them had a fixed perch, and, from their deafening and angry cawing, it may be inferred that, every night, they have to contend for a convenient sleeping place. Sometimes, it would appear as if they were holding a court, for, bodies of them are seen, frequently, to separate themselves from the main crowd and, after conferring, as it were, beat and banish a member--presumably a criminal--and then return to the rookery. During the war, they disappeared and, no doubt, sought a more peaceful home. Besides, in those sad years agriculture was neglected in this region and it may be supposed that these sagacious birds sought for plenty as well as peace. Even after the war, they no longer frequented the Loudoun Mountain, but took to the Maryland Heights, where they may be seen every morning and evening in the autumn and winter, starting out on their forays or returning to their inaccessible resting place. Their numbers vary very much, however, for, during several consecutive years, they will be comparatively few, while for another period, they will appear in countless thousands. They always disappear in the spring to fulfill the great law of increase and multiplication, but, strange to say, a crow's nest is a comparatively rare sight in the Virginia or Maryland woods, and as far as the writer is advised, it is the same in the neighboring states. The farmers are unrelenting enemies of the crows, and they never neglect an opportunity for their destruction, and the sagacious birds, knowing this by instinct and experience, no doubt, take special pains to protect their young by rearing them in the least accessible places. Some day, perhaps, we will know what useful part the crow takes in the economy of Mother Nature. That he does something to compensate for the corn he consumes, no reflecting man will be disposed to deny but what that service is, certainly, no Virginia or Maryland grain producer appears to have discovered, if we are to judge from the amount of profanity heard from those hard-fisted tillers of the soil, when the subject of crows is mentioned.