"Several," replied Peter. "They are fairly common objects down in Kent. Get quite accustomed to them. Latterly I have slept soundly, in spite of the noise of the engines. Of course they didn't drop any bombs in that particular district. In point of fact they eventually dumped their dangerous cargo into some fields a few miles from anywhere. Our lighting restrictions are far more stringent than they are up here. Barborough is a blaze of light compared, say, with Tangtable or Cobley, the nearest large towns to Alderdene, where I used to live." "You used to sleep through it," repeated Mr. Entwistle. "That reminds me. I noticed that when we were walking up and down the platform just now you invariably got round to my left as we turned. Are you deaf in one ear?" "Yes," replied Peter. "Stone deaf in my left. A really valuable asset when one has to be in the presence of bores, or enduring curtain lectures and the like." "Then we may congratulate ourselves," was his companion's response. "I, too, am deaf, only in my right ear. When I was at school at Scarborough a brute of a master hiked me up by my ears. Result, deafness in one of them. Yes, I agree, it's very convenient at times." By now they had breasted the steep rise out of Windyhill and had gained the bleak summit of the lofty ridge. In ordinary circumstances would be seen the twinkling lights from scores of factories--"works" as these are termed locally--in the five distinct valleys that radiate from this particular spur. All was now in utter darkness, save for a feeble glimmer from an isolated signal-box at the entrance to a deep cutting. "That chap's looking for trouble," declared Barcroft, indicating the dim patch of luminosity. "They would spot that for a distance of ten miles. I say, isn't the atmosphere clear for this part of the country, and in autumn, too. It's the first absolutely fine night I have seen since I've lived here--ideal for Zeps., too. No wind to speak of and pitch dark. Listen." The two men stopped abruptly. Above the faint rumble of the evening breeze could be distinguished a subdued and distinct hum. "That's the brute," declared Peter. "It's a Zep, sure enough." "Certain?" asked Entwistle anxiously. "Rather--and it's coming this way." In silence the two pedestrians waited. Nearer and nearer came the now increasing buzzing of the engines of the immense gas-bag. Vainly they attempted to detect the elongated airship. With heads thrown back they strove to pierce the black vault above. The "thing" was there, but it was invisible from where they stood. Only by the sinister sounds did they know of its presence. Then with the same rapidity as the unseen had approached the whirr grew fainter and fainter until it was heard no longer. "Phew!" ejaculated Entwistle, mopping his forehead. "I'm not of a funky nature, but, by Jove! I'm glad that beastly thing's gone. It gives a fellow a peculiar sensation somewhere in the region of the stomach. What's the time?"