drink without hurt the water from which it had been strained. The
vapour did not diffuse as a true gas would do. It hung together in
banks, flowing sluggishly down the slope of the land and driving
reluctantly before the wind, and very slowly it combined with the mist
and moisture of the air, and sank to the earth in the form of dust.
Save that an unknown element giving a group of four lines in the blue
of the spectrum is concerned, we are still entirely ignorant of the
nature of this substance.
Once the tumultuous upheaval of its dispersion was over, the black
smoke clung so closely to the ground, even before its precipitation,
that fifty feet up in the air, on the roofs and upper stories of high
houses and on great trees, there was a chance of escaping its poison
altogether, as was proved even that night at Street Cobham and Ditton.
The man who escaped at the former place tells a wonderful story of the
strangeness of its coiling flow, and how he looked down from the church
spire and saw the houses of the village rising like ghosts out of its
inky nothingness. For a day and a half he remained there, weary,
starving and sun-scorched, the earth under the blue sky and against the
prospect of the distant hills a velvet-black expanse, with red roofs,
green trees, and, later, black-veiled shrubs and gates, barns,
outhouses, and walls, rising here and there into the sunlight.
But that was at Street Cobham, where the black vapour was allowed to
remain until it sank of its own accord into the ground. As a rule the
Martians, when it had served its purpose, cleared the air of it again
by wading into it and directing a jet of steam upon it.
This they did with the vapour banks near us, as we saw in the starlight
from the window of a deserted house at Upper Halliford, whither we had
returned. From there we could see the searchlights on Richmond Hill and
Kingston Hill going to and fro, and about eleven the windows rattled,
and we heard the sound of the huge siege guns that had been put in
position there. These continued intermittently for the space of a
quarter of an hour, sending chance shots at the invisible Martians at
Hampton and Ditton, and then the pale beams of the electric light
vanished, and were replaced by a bright red glow.
Then the fourth cylinder fell a brilliant green meteor as I learned
78