d it provided them with a very
inflammable substance, especially afterwards when the engineer had
impregnated it with nitrate of potash, of which the island possessed
several beds, and which is in truth saltpeter.

The colonists had a good supper that evening. Neb prepared some agouti
soup, a smoked capybara ham, to which was added the boiled tubercules of
the "caladium macrorhizum," an herbaceous plant of the arum family.
They had an excellent taste, and were very nutritious, being something
similar to the substance which is sold in England under the name of
"Portland sago"; they were also a good substitute for bread, which the
settlers in Lincoln Island did not yet possess.

When supper was finished, before sleeping, Harding and his companions
went to take the air on the beach. It was eight o'clock in the evening;
the night was magnificent. The moon, which had been full five days
before, had not yet risen, but the horizon was already silvered by those
soft, pale shades which might be called the dawn of the moon. At the
southern zenith glittered the circumpolar constellations, and above all
the Southern Cross, which some days before the engineer had greeted on
the summit of Mount Franklin.

Cyrus Harding gazed for some time at this splendid constellation, which
has at its summit and at its base two stars of the first magnitude, at
its left arm a star of the second, and at its right arm a star of the
third magnitude.

Then, after some minutes thought--

"Herbert," he asked of the lad, "is not this the 15th of April?"

"Yes, captain," replied Herbert.

"Well, if I am not mistaken, to-morrow will be one of the four days in
the year in which the real time is identical with average time; that
is to say, my boy, that to-morrow, to within some seconds, the sun will
pass the meridian just at midday by the clocks. If the weather is fine
I think that I shall obtain the longitude of the island with an
approximation of some degrees."

"Without instruments, without sextant?" asked Gideon Spilett.

"Yes," replied the engineer. "Also, since the night is clear, I will
try, this very evening, to obtain our latitude by calculating the
height of the Southern Cross, that is, from the southern pole above the
horizon. You understand, my friends, that before undertaking the work
of installation in earnest it is not enough to have found out that this
land is an island; we must, as nearly as possible, know at what distance
it is sit