_The Director of the Cambridge Observatory to the President
of the Gun Club at Baltimore._


CAMBRIDGE, October 7.
On the receipt of your favor of the 6th instant, addressed to
the Observatory of Cambridge in the name of the members of the
Baltimore Gun Club, our staff was immediately called together,
and it was judged expedient to reply as follows:

The questions which have been proposed to it are these--

"1. Is it possible to transmit a projectile up to the moon?

"2. What is the exact distance which separates the earth from
its satellite?

"3. What will be the period of transit of the projectile when
endowed with sufficient initial velocity? and, consequently, at
what moment ought it to be discharged in order that it may touch
the moon at a particular point?

"4. At what precise moment will the moon present herself in the
most favorable position to be reached by the projectile?

"5. What point in the heavens ought the cannon to be aimed at
which is intended to discharge the projectile?

"6. What place will the moon occupy in the heavens at the moment
of the projectile's departure?"