"For God's sake, Addison," he said, "what does it mean? What unholy thing haunts Low Fennel? You've studied these beastly subjects, and I rely upon you to make the place clean and good to live in again." "Major," I replied, "I doubt if Low Fennel will ever be fit to live in. At any time an abnormal rise of temperature might produce the most dreadful results." "You don't mean to tell me----" "If you care to have the new wing pulled down and the wall bricked up again, if you care to keep all your doors and windows fastened securely whenever the thermometer begins to exhibit signs of rising, if you avoid going out on hot nights after dusk, as you would avoid the plague--yes, it may be possible to live in Low Fennel." Again the Major became speechless, but finally: "What d'you mean, Addison?" he whispered; "for God's sake, tell me. What is it?--what is it?" "It is what some students have labelled an 'elemental' and some a 'control,'" I replied; "it is something older than the house, older, perhaps, than the very hills, something which may never be classified, something as old as the root of all evil, and it dwells in the Ancient British tumulus." V As I had hoped, for my plans were dependent upon it, the mercury towered steadily throughout that day, and showed no signs of falling at night; the phenomenal heat-wave continued uninterruptedly. The household was late retiring, for the grey lord--Fear--had imposed his will upon all within it. Every shadow in the rambling old building became a cavern of horrors, every sound that disturbed the ancient timbers a portent and a warning. That the servants proposed to leave _en masse_ at the earliest possible moment was perfectly evident to me; in a word, all the dark old stories which had grown up around Low Fennel were revived and garnished, and new ones added to them. The horror of the night before had left its mark upon every one, and the coming of dusk brought with it such a dread as could almost be felt in the very atmosphere of the place. Ghostly figures seemed to stir the hangings, ghostly sighs to sound from every nook of the old hall and stairway; baleful eyes looked in at the open windows, and the shrubberies were peopled with hosts of nameless things who whispered together in evil counsel. Mrs. Dale was as loath to retire as were the servants, more especially since the Major and I were unable to disguise from her our intention of watching for the strange visitant that night. But finally we prevailed upon her to depart, and she ran upstairs as though the legions of the lost pursued her, slamming and locking her door so that the sound echoed all over the house. We had told her nothing, of course, of my discoveries and theories, but nevertheless the cat was out of the bag; the affair of the night before had spoilt our scheme of secrecy.