"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."Missed him," said the thrower, thrusting his hand into his pocket, and bringing out a similar object to that which he had used as a missile, but putting it to a far different purpose; for he raised it to his mouth, drew back his red lips, and with one sharp crunch drove two rows of white teeth through the ruddy skin, cut out a great circular piece of apple, spat it out, and threw the rest away.