"It appears," continued Bainbridge, on the following evening, "that
Hili-li was subject to the recurrence about once in forty-seven years of
a strange thermic phenomenon, the mean duration of which was about fifty
hours. This change had occurred twenty-one times in the preceding
thousand years; its duration had once been as brief as thirty hours, and
at another time had lasted one hundred and twenty hours. The interval
between two of its visitations had once been somewhat less than eight
years; whilst at the period of Pym and Peters' presence in Hili-li, it
had not occurred for eighty-six years and some months. For some reason
that could not be conjectured, at these times the wind-currents,
generally varying but slightly in force and duration, changed, the wind
coming from a point of the compass almost diametrically opposite to its
usual direction, and increasing in velocity and force to that of a
tempest or blizzard. The result was, that in a very few hours the
temperature of Hili-li fell to about zero Fahrenheit, if in December or
January; to 60 deg. or 70 deg. Fahrenheit below freezing, if in July or August.
During the first few hours of the change, owing to the extremely moist
state of the atmosphere for many miles in all directions from the crater
of Hili-li, there occurred a heavy snowfall--which, however, diminished
as the temperature fell, until at somewhat above the zero point it
ceased.

"The government of Hili-li, by laws and by the encouragement of custom,
did much to prevent damage from these storms--which, as I have
intimated, were a combination of hurricane and snow-storm, with a very
sudden and rapid fall of temperature; and when the interval between two
of them was not greater than twenty years, the provisions made by the
state were ample to prevent loss of life. By the law of the land,