CHAPTER XI.
FLORIDA AND TEXAS.
There still remained one question to be decided--a place favourable to the experiment had to be chosen.

According to the recommendation of the Cambridge Observatory the gun must be aimed perpendicularly to the plane of the horizon--that is to say, towards the zenith.

Now the moon only appears in the zenith in the places situated between 0 deg.

and 28 deg.

of latitude, or, in other terms, when her declination is only 28 deg..