story I wrote for that magazine, before assuming the
charge of "Old and New," a magazine which I edited from
1870 to 1876, and for which I wrote "Ten Times One is
Ten," which has been printed in the third volume of this
series.

Among the kind references to "The Brick Moon" which
I have received from sympathetic friends, I now recall
with the greatest pleasure one sent me by Mr. Asaph Hall,
the distinguished astronomer of the National Observatory.
In sending me the ephemeris of the two moons of Mars,
which he revealed to this world of ours, he wrote, "The
smaller of these moons is the veritable Brick Moon."
That, in the moment of triumph for the greatest
astronomical discovery of a generation, Dr. Hall should
have time or thought to give to my little parable,--this
was praise indeed.

Writing in 1870, I said, as the reader will see on
page 66, that George Orcutt did not tell how he used a
magnifying power of 700. Nor did I choose to tell then,
hoping that in some fortunate winter I might be able
myself to repeat his process, greatly to the convenience
of astronomers who have not Alvan Clark's resources at
hand, or who have to satisfy themselves with glass lenses
of fifteen inches, or even thirty, in diameter. But no
such winter has come round to me, and I will now give
Orcutt's invention to the world. He had unlimited
freezing power. So have we now, as we had not then.
With this power he made an ice lens, ten feet in