he time we could not understand these things, but later I
was to learn the meaning of these ominous kopjes that gathered in the
twilight. Each of the Martians, standing in the great crescent I have
described, had discharged, by means of the gunlike tube he carried, a
huge canister over whatever hill, copse, cluster of houses, or other
possible cover for guns, chanced to be in front of him. Some fired
only one of these, some two--as in the case of the one we had seen;
the one at Ripley is said to have discharged no fewer than five at
that time. These canisters smashed on striking the ground--they did
not explode--and incontinently disengaged an enormous volume of heavy,
inky vapour, coiling and pouring upward in a huge and ebony cumulus
cloud, a gaseous hill that sank and spread itself slowly over the
surrounding country. And the touch of that vapour, the inhaling of
its pungent wisps, was death to all that breathes.

It was heavy, this vapour, heavier than the densest smoke, so that,
after the first tumultuous uprush and outflow of its impact, it sank
down through the air and poured over the ground in a manner rather
liquid than gaseous, abandoning the hills, and streaming into the
valleys and ditches and watercourses even as I have heard the
carbonic-acid gas that pours from volcanic clefts is wont to do. And
where it came upon water some chemical action occurred, and the
surface would be instantly covered with a powdery scum that sank
slowly and made way for more. The scum was absolutely insoluble, and
it is a strange thing, seeing the instant effect of the gas, that one
could 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.