"Derry down, derry down, derry down " A cheery voice rolling out the chorus of an old west-country ditty. Then there was a run of a few yards, a sudden stoppage, and a round, red missile was thrown with considerable force after a blackcock, which rose on whirring wings from among the heather, his violet-black plumage glistening in the autumn sun, as he skimmed over the moor, and disappeared down the side of a hollow coombe.