There is probably nothing in ordinary life much more difficult than to pick up and retain in the lenses of a telescope, levelled by hand, a spark of light so minute and faint as to be invisible to the unaided eye in the midst of the surrounding darkness, and the difficulty is enhanced when the attempt is made from the deck of a small vessel oscillating though ever so gently on the ridges of a long, low-running swell, and for the life of me I could not again find the feeble glimmer that had seemed to swim athwart the instrument, try as I would.
