tion of two notes, "Ulla, ulla, ulla, ulla," keeping on perpetually. When I passed streets that ran northward it grew in volume, and houses and buildings seemed to deaden and cut it off again. It came in a full tide down Exhibition Road. I stopped, staring towards Kensington Gardens, wondering at this strange, remote wailing. It was as if that mighty desert of houses had found a voice for its fear and solitude.
"Ulla, ulla, ulla, ulla," wailed that superhuman note—great waves of sound sweeping down the broad, sunlit roadway, between the tall buildings on each side. I turned northward, marvelling, towards the iron gates of Hyde Park. I had half a mind to break into the Natural History Museum and find my way up to the summits of the towers, in order to see across the park. But I decided to keep to the ground, where quick hiding was possible, and so went on up the Exhibition Road. All the large mansions on each side of the road were empty and still, and my footsteps echoed against the sides of the houses. At the top, near the park gate, I came upon a strange sight—a bus overturned, and the skeleton of a horse picked clean. I puzzled over this for a time, and then went on to the bridge over the Serpentine. The voice grew stronger and stronger, though I could see nothing above the house-tops on the north side of the park, save a haze of smoke to the north-west.
"Ulla, ulla, ulla, ulla," cried the voice, coming, as it seemed to me, from the district about Regent's Park. The desolating cry worked upon my mind. The mood that had sustained me passed. The wail-
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