I craned my head round the corner, but at first the effect of the fog was so confusing that every patch of white driving about before the wind looked like a moving tent and it was some seconds before I discovered the one patch that held steady. Then I saw that it was shaking all over, and the sides, flapping as much as the tightness of the ropes allowed, were the cause of the booming sound we had heard. Something alive was tearing frantically about inside, banging against the stretched canvas in a way that made me think of a great moth dashing against the walls and ceiling of a room. The tent bulged and rocked.

“It’s trying to get out, by Jupiter!” muttered the clergyman, rising to his feet and turning to the side where the unloaded rifle lay. I sprang up too, hardly knowing what purpose was in my mind, but anxious to be prepared for anything. John Silence, however, was before us both, and his figure slipped past and blocked the doorway of the tent. And there was some quality in his voice next minute when he began to speak that brought our minds instantly to a state of calm obedience.