The
southern pack and bergs, catching the sun's rays, are golden, but to
the north the ice-masses are purple. Here the bergs assume changing
forms, first a castle, then a balloon just clear of the horizon, that
changes swiftly into an immense mushroom, a mosque, or a cathedral.
The principal characteristic is the vertical lengthening of the object,
a small pressure-ridge being given the appearance of a line of
battlements or towering cliffs. The mirage is produced by refraction
and is intensified by the columns of comparatively warm air rising from
several cracks and leads that have opened eight to twenty miles away
north and south."
We noticed this day that a considerable change had taken place in our
position relative to the Rampart Berg. It appeared that a big lead had
opened and that there had been some differential movement of the pack.
The opening movement might presage renewed pressure. A few hours later
the dog teams, returning from exercise, crossed a narrow crack that had
appeared ahead of the ship. This crack opened quickly to 60 ft. and
would have given us trouble if the dogs had been left on the wrong
side. It closed on the 25th and pressure followed in its neighbourhood.
On August 24 we were two miles north of the latitude of Morell's
farthest south, and over 10° of longitude, or more than 200 miles, west
of his position.
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