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This was said in a tone which quenched Michel Ardan's last hope. The portion of the moon which the projectile was nearing was the northern hemisphere, that which the selenographic maps place below; for these maps are generally drawn after the outline given by the glasses, and we know that they reverse the objects. Such was the Mappa Selenographica of Boeer and Moedler which Barbicane consulted.
Maps of the Moon therefore, being drawn from the image formed by the telescope, show the north in the lower part, and vice versa. Of this kind was the Mappa Selenographica, by Beer and Maedler, so often previously alluded to and now carefully consulted by Barbican. At midnight the Moon was full.
At this moment, to the left, lay extended one of the finest circles of lunar orography, one of the curiosities of this continent. It was Newton, which Barbicane recognized without trouble, by referring to the Mappa Selenographica. Newton is situated in exactly 77@ south latitude, and 16@ east longitude.
With the help of Boeer and Moedler's Mappa Selenographica, the travelers were able at once to recognize that portion of the disc enclosed within the field of their glasses. "What are we looking at, at this moment?" asked Michel. "At the northern part of the `Sea of Clouds," answered Barbicane. "We are too far off to recognize its nature.
The selenographic maps make it the lower one, because they are generally drawn up according to the image given by the telescopes, and we know that they reverse the objects. Such was the Mappa Selenographica of Boeer and Moedler which Barbicane consulted. This northern hemisphere presented vast plains, relieved by isolated mountains. At midnight the moon was full.
Not one in a thousand, not one in ten thousand, has ever examined even the map of our only Satellite. To guard our beloved and intelligent reader against this reproach, we have prepared an excellent reduction of Beer and Maedler's Mappa, on which, for the better understanding of what is to follow, we hope he will occasionally cast a gracious eye.
The travelers being desirous of examing the moon carefully during their voyage, in order to facilitate their studies, they took with them Boeer and Moeller's excellent Mappa Selenographica, a masterpiece of patience and observation, which they hoped would enable them to identify those physical features in the moon, with which they were acquainted.
Lohrman of Dresden published in 1838 an excellent map of the Moon, 15 inches in diameter, accompanied by descriptive text and several charts of particular portions on a larger scale. But this and all other maps were thrown completely into the shade by Beer and Maedler's famous Mappa Selenographica, so often alluded to in the course of this work.
At that moment there stretched to the left one of the finest amphitheatres in lunar orography. It was Newton, which Barbicane easily recognised by referring to the Mappa Selenographica. Newton is situated in exactly 77° south lat. and 16° east long. It forms a circular crater, the ramparts of which, 7,264 metres high, seemed to be inaccessible.
Herschel was the first to come pretty close to the truth, but Beer and Maedler, whose Mappa Selenographica now lies before us, have left really nothing more to be done for lunar astronomy except, of course, to pay a personal visit to the Moon which we have tried to do, but I fear with a very poor prospect of success." "Cheer up! cheer up!" cried Ardan. "It's not all over yet by long odds.
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