appears. The representation of the mountains and
plains is therefore correct only in the central portion; elsewhere,
north, south, east, or west, the features, being foreshortened, are
crowded together, and cannot be compared in measurement with those in
the centre. It is more than three feet square; for convenient reference
it is divided into four parts, each having a very full index; in short,
this map is in all respects a master piece of lunar cartography.[B]

After Beer and Maedler, we should allude to Julius Schmitt's (of Athens)
excellent selenographic reliefs: to Doctor Draper's, and to Father
Secchi's successful application of photography to lunar representation;
to De La Rue's (of London) magnificent stereographs of the Moon, to be
had at every optician's; to the clear and correct map prepared by
Lecouturier and Chapuis in 1860; to the many beautiful pictures of the
Moon in various phases of illumination obtained by the Messrs. Bond of
Harvard University; to Rutherford's (of New York) unparalleled lunar
photographs; and finally to Nasmyth and Carpenter's wonderful work on
the Moon, illustrated by photographs of her surface in detail, prepared
from models at which they had been laboring for more than a quarter of
the century.

Of all these maps, pictures, and projections, Barbican had provided
himself with only two--Beer and Maedler's in German, and Lecouturier and
Chapuis' in French. These he considered quite sufficient for all
purposes, and certainly they considerably simplified his labors as an
observer.

His best optical instruments were several excellent marine telescopes,
manufactured especially under his direction. Magnifying the object a
hundred times, on the surface of the Earth they would have brought the
Moon to within a distance of somewhat less than 2400 miles. But at the
point to which our travellers had arrived towards three o'clock in the
morning, and which could hardly be more than 12 or 1300 miles from the
Moon, these telescopes, ranging through a medium disturbed by no
atmosphere, easily brought the lunar surface to within less than 13
miles' distance from the eyes of our adventurers.

Therefore they should now see objects in the Moon as clearly as people
can see the opposite bank of a river that is about 12 miles wide.

[Footnote A: In our Map of the Moon, prepared expressly for this work,
we have so far improved on Beer and Maedler as to give her surface as it
appears to the naked eye: