an unexpected or altered
result.

On the sixth day, I perceived another nebula, and on this occasion in
a more promising direction. It appeared, from its gradual movement, to
lie almost exactly in my course, so that if it were what I suspected,
and were not at any great distance from me, I must pass either near or
through it, and it would surely explain what had perplexed and baffled
me in the case of the former nebula. At this distance the nature of
the cloudlet was imperceptible to the naked eye. The window telescope
was not adjustable to an object which I could not bring conveniently
within the field of view of the lenses. In a few hours the nebula so
changed its form and position, that, being immediately over the
portion of the roof between the front or bow lens and that in the
centre of the roof, its central section was invisible; but the
extremities of that part which I had seen in the first instance
through the upper plane window of the bow were now clearly visible
from the upper windows of either side. What had at first been a mere
greatly elongated oval, with a species of rapidly diminishing tail at
each extremity, had now become an arc spanning no inconsiderable part
of the space above me, narrowing rapidly as it extended downwards and
sternwards. Presently it came in view through the upper lens, but did
not obscure in the least the image of the stars which were then
visible in the metacompass. I very soon ascertained that the cloudlet
consisted, as I had supposed in the former case, of a multitude of
points of light less brilliant than the stars, the distance between
which became constantly wider, but which for some time were separately
so small as to present no disc that any magnifying power at my command
could render measurable. In the meantime, the extremities visible
through the other windows were constantly widening out till lost in
the spangled darkness. By and by, it became impossible with the naked
eye to distinguish the individual points from the smaller stars; and
shortly after this the nearest began to present discs of appreciable
size but somewhat irregular shape. I had now no doubt that I was about
to pass through one of those meteoric rings which our most advanced
astronomers believe to exist in immense numbers throughout space, and
to the Earth's contact with or approach to which they ascribe the
showers of falling, stars visible in August and November. Ere long,
one after another of these bod