ver to return?"

"I did not say an hyperbola."

"And is it not?"

"It is not."

"Then it must be an ellipse?"

"Yes."

"And does its plane coincide with the plane of the earth?"

"Yes."

"Then it must be a periodic comet?"

"It is."

Servadac involuntarily raised a ringing shout of joy that echoed again
along the gallery.

"Yes," continued the professor, "Gallia is a periodic comet, and
allowing for the perturbations to which it is liable from the attraction
of Mars and Jupiter and Saturn, it will return to the earth again in two
years precisely."

"You mean that in two years after the first shock, Gallia will meet the
earth at the same point as they met before?" said Lieutenant Procope.

"I am afraid so," said Rosette.

"Why afraid?"

"Because we are doing exceedingly well as we are." The professor stamped
his foot upon the ground, by way of emphasis, and added, "If I had my
will, Gallia should never return to the earth again!"

CHAPTER IV. A REVISED CALENDAR

All previous hypotheses, then, were now forgotten in the presence of the
one great fact that Gallia was a comet and gravitating through remote
solar regions. Captain Servadac became aware that the huge disc that
had been looming through the clouds after the shock was the form of the
retreating earth, to the proximity of which the one high tide they had
experienced was also to be attributed.

As to the fulfillment of the professor's prediction of an ultimate
return to the terrestrial sphere, that was a point on which it must
be owned that the captain, after the first flush of his excitement was
over, was not without many misgivings.

The next day or two were spent in providing for the accommodation of the
new comer. Fortunately his desires were very moderate; he seemed to live
among the stars, and as long as he was well provided with coffee, he
cared little for luxuries, and paid little or no regard to the ingenuity
with which all the internal arrangements of Nina's Hive had been
devised. Anxious to show all proper respect to his former tutor,
Servadac proposed to leave the most comfortable apartment of the place
at his disposal; but the professor resolutely declined to occupy it,
saying that what he required was a small chamber, no matter how small,
provided that it was elevated and secluded, which he could use as
an observatory and where he might prosecute his studies without
disturbance. A general search was instituted, and befo