the ashy tint so well known to us on Earth, but the rest of her surface sparkled with all its former radiation, Tycho glowing like a sun in the midst of the general resplendescence.
Barbican attempted in vain to obtain even a tolerable approximation of the velocity at which the Projectile was now moving. He had to content himself with the knowledge that it was diminishing at a uniform rate—of which indeed a little reflection on a well known law of Dynamics readily convinced him. He had not much difficulty even in explaining the matter to his friends.
"Once admitting," said he, "the Projectile to describe an orbit round the Moon, that orbit must of necessity be an ellipse. Every moving body circulating regularly around another, describes an ellipse. Science has proved this incontestably. The satellites describe ellipses around the planets, the planets around the Sun, the Sun himself describes an ellipse around the unknown star that serves as a pivot for our whole solar system. How can our Baltimore Gun Club Projectile then escape the universal law?
"Now what is the consequence of this law? If the orbit were a circle, the satellite would always preserve the same distance from its primary, and its velocity should therefore be constant. But the orbit being an ellipse, and the attracting body always occupying one of the foci, the satellite must evidently lie nearer to this focus in one part of its orbit than in another. The Earth when nearest to the Sun, is in her perihelion; when most distant, in her aphelion. The Moon, with regard to the Earth, is similarly in her perigee, and her apogee. Analogous expressions denoting the relations of the Projectile towards the Moon, would be periselene and aposelene. At its aposelene the Projectile's velocity would have reached its minimum; at the periselene, its maximum. As it is to the former point that we are now moving, clearly the velocity must keep on diminishing until that point is reached. Then, if it does not die out altogether, it must spring up again, and even accelerate as it reapproaches the Moon. Now the great trouble is this: If the Aposelenetic point should coincide with the point of lunar attraction, our velocity must certainly become nil, and the Projectile must remain relatively motionless forever!"
"What do you mean by 'relatively motionless'?" asked M'Nicholl, who was carefully studying the situation.
"I mean, of course, not absolutely motionless," answered Barbican; "absolute immobility is, as you are well aware, altogether impossible, but motionless with regard to the Earth and the—"
"By Mahomet's jackass!" interrupted Ardan hastily, "I must say we're a precious set of imbéciles!"
"I don't deny it, dear friend," said Barbican quietly, notwithstanding the unceremonious interruption; "but why do you say so just now?"
"Because though we are possessed of the power of retarding the velocity that takes us from the Moon, we have never thought of employing it!"
"What do you mean?"
"Do you forget the rockets?"
"It's a fact!" cried M'Nicholl. "How have we forgotten them?"
"I'm sure I can't tell," answered Barbican, "unless, perhaps, because we had too many other things to think about. Your thought, my dear friend, is a most happy one, and, of course, we shall utilize it."
"When? How soon?"
"At the first favorable opportunity, not sooner. For you can see for yourselves, dear friends," he went on explaining, "that with the present obliquity of the Projectile with regard to the lunar disc, a discharge of our rockets would be more likely to send us away from the Moon than towards her. Of course, you are both still desirous of reaching the Moon?"
"Most emphatically so!"
"Then by reserving our rockets for the last chance, we may possibly get there after all. In consequence of some force, to me utterly inexplicable, the Projectile still seems disposed to turn its base towards the Earth. In fact, it is likely enough that at the neutral point its cone will point vertically to the Moon. That being the moment when its velocity will most probably be nil, it will also be the moment for us to discharge our rockets, and the possibility is that we may force a direct fall on the lunar disc."
"Good!" cried Ardan, clapping hands.
"Why didn't we execute this grand manoeuvre the first time we reached the neutral point?" asked M'Nicholl a little crustily.
"It would be useless," answered Barbican; "the Projectile's velocity at that time, as you no doubt remember, not only did not need rockets, but was actually too great to be affected by them."
"True!" chimed in Ardan; "a wind of four miles an hour is very little use to a steamer going ten."
"That assertion," cried M'Nicholl, "I am rather dis—"
—"Dear friends," interposed Barbican, his pale face beaming and his clear voice ringing with the new excitement; "let us just now waste no time in mere words. We have one more chance, perhaps a great one. Let us not throw it away! We have been on the brink of despair—"
—"Beyond it!" cried Ardan.
—"But I now begin to see a possibility, nay, a very decided probability, of our being able to attain the great end at last!"
"Bravo!" cried Ardan.
"Hurrah!" cried M'Nicholl.
"Yes! my brave boys!" cried Barbican as enthusiastically as his companions; "all's not over yet by a long shot!"
What had brought about this great revulsion in the spirits of our bold adventurers? The breakfast? Prince Esterhazy's Tokay? The latter, most probably. What had become of the resolutions they had discussed so ably and passed so decidedly a few hours before? Was the Moon inhabited? No! Was the Moon habitable? No! Yet in the face of all this—or rather as coolly as if such subjects had never been alluded to—here were the reckless scientists actually thinking of nothing but how to work heaven and earth in order to get there!
One question more remained to be answered before they played their last trump, namely: "At what precise moment would the Projectile reach the neutral point?"
To this Barbican had very little trouble in finding an answer. The time spent in proceeding from the south pole to the dead point being evidently equal to the time previously spent in proceeding from the dead point to the north pole—to ascertain the former, he had only to calculate the latter. This was easily done. To refer to his notes, to check off the different rates of velocity at which they had readied the different parallels, and to turn these rates into time, required only a very few minutes careful calculation. The Projectile then was to reach the point of neutral attraction at one o'clock in the morning of December 8th. At the present time, it was five o'clock in the morning of the 7th; therefore, if nothing unforeseen should occur in the meantime, their great and final effort was to be made about twenty hours later.
The rockets, so often alluded to as an idea of Ardan's and already fully described, had been originally provided to break the violence of the Projectile's fall on the lunar surface; but now the dauntless travellers were about to employ them for a purpose precisely the reverse. In any case, having been put in proper order for immediate use, nothing more now remained to be done till the moment should come for firing them off.
"Now then, friends," said M'Nicholl, rubbing his eyes but hardly able to keep them open, "I'm not over fond of talking, but this time I think I may offer a slight proposition."
"We shall be most happy to entertain it, my dear Captain," said Barbican.
