Henceforward I shall not record my
observations, except where they implied 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.
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