estowed even upon efforts that seemed
most unpromising. After work was well organized, Mr. Crossley,
of England, presented the observatory with a reflecting telescope
of large size, but which had never gained a commanding reputation.
No member of the staff at first seemed ambitious to get hold of such
an instrument, but, in time, Keeler gave it a trial in photographing
nebulae. Then it was found that a new field lay open. The newly
acquired reflector proved far superior to other instruments for this
purpose, the photographic plates showing countless nebulae in every
part of the sky, which the human eye was incapable of discerning in
the most powerful of telescopes.

In 1892, only four years after the mounting of the telescope, came
the surprising announcement that the work of Galileo on Jupiter had
been continued by the discovery of a fifth satellite to that planet.
This is the most difficult object in the solar system, only one or two
observers besides Barnard having commanded the means of seeing it.
The incident of my first acquaintance with the discoverer is not
flattering to my pride, but may be worth recalling.

In 1877 I was president of the American Association for the
Advancement of Science at the meeting held in Nashville. There I was
told of a young man a little over twenty years of age, a photographer
by profession, who was interested in astronomy, and who desired to see
me. I was, of course, very glad to make his acquaintance. I found
that with his scanty earnings he had managed either to purchase or
to get together the materials for making a small telescope. He was
desirous of doing something with it that might be useful in astronomy,
and wished to know what suggestions I could make in that line. I did
not for a moment suppose that there was a reasonable probability of
the young man doing anything better than amuse himself. At the same
time, feeling it a duty to encourage him, I suggested that there
was only one thing open to an astronomical observer situated as he
was, and that was the discovery of comets. I had never even looked
for a comet myself, and knew little about the methods of exploring
the heavens for one, except what had been told me by H. P. Tuttle.
But I gave him the best directions I could, and we parted. It is
now rather humiliating that I did not inquire more thoroughly into
the case. It would have taken more prescience than I was gifted
with to expect that I should live to se