orized blackboard. The handwriting corresponded with that of the
papers already received; the blackboard was covered with algebraical
symbols traced in chalk, which they were careful not to obliterate;
and the papers, which consisted for the most part of detached scraps,
presented a perfect wilderness of geometrical figures, conic sections of
every variety being repeated in countless profusion.

Lieutenant Procope pointed out that these curves evidently had reference
to the orbits of comets, which are variously parabolic, hyperbolic, or
elliptic. If either of the first two, the comet, after once appearing
within the range of terrestrial vision, would vanish forever in the
outlying regions of space; if the last, it would be sure, sooner or
later, after some periodic interval, to return.

From the _prima facie_ appearance of his papers, then, it seemed
probable that the astronomer, during his sojourn at Formentera, had been
devoting himself to the study of cometary orbits; and as calculations of
this kind are ordinarily based upon the assumption that the orbit is a
parabola, it was not unlikely that he had been endeavoring to trace the
path of some particular comet.

"I wonder whether these calculations were made before or after the 1st
of January; it makes all the difference," said Lieutenant Procope.

"We must bide our time and hear," replied the count.

Servadac paced restlessly up and down. "I would give a month of my
life," he cried, impetuously, "for every hour that the old fellow goes
sleeping on."

"You might be making a bad bargain," said Procope, smiling. "Perhaps
after all the comet has had nothing to do with the convulsion that we
have experienced."

"Nonsense!" exclaimed the captain; "I know better than that, and so do
you. Is it not as clear as daylight that the earth and this comet have
been in collision, and the result has been that our little world has
been split off and sent flying far into space?"

Count Timascheff and the lieutenant looked at each other in silence. "I
do not deny your theory," said Procope after a while. "If it be correct,
I suppose we must conclude that the enormous disc we observed on the
night of the catastrophe was the comet itself; and the velocity with
which it was traveling must have been so great that it was hardly
arrested at all by the attraction of the earth."

"Plausible enough," answered Count Timascheff; "and it is to this comet
that our scientific friend here h