for signs of land to the westward, and he reported an interesting
phenomenon. The sun set amid a glow of prismatic colours on a line of
clouds just above the horizon. A minute later Worsley saw a golden
glow, which expanded as he watched it, and presently the sun appeared
again and rose a semi-diameter clear above the western horizon. He
hailed Crean, who from a position on the floe 90 ft. below the crow's-
nest also saw the re-born sun. A quarter of an hour later from the deck
Worsley saw the sun set a second time. This strange phenomenon was due
to mirage or refraction. We attributed it to an ice-crack to the
westward, where the band of open water had heated a stratum of air.

The drift of the pack was not constant, and during the succeeding days
the crevassed berg alternately advanced and receded as the 'Endurance'
moved with the floe. On Sunday, April 18, it was only seven miles
distant from the ship.

"It is a large berg, about three-quarters of a mile long on the side
presented to us and probably well over 200 ft. high. It is heavily
crevassed, as though it once formed the serac portion of a glacier. Two
specially wide and deep chasms across it from south-east to north-west
give it the appearance of having broken its back on the shoal-ground.
Huge masses of pressure-ice are piled against its cliffs to a height of
about 60 ft., showing the stupendous force that is being brought to
bear upon it by the drifting pack. The berg must be very firmly
aground. We swing the arrow on the current-meter frequently and watch
with keen attention to see where it will come to rest. Will it point
straight for the berg, showing that our drift is in that direction? It
swings slowly round. It points to the north-east end of the berg, then
shifts slowly to the centre and seems to stop; but it moves again and
swings 20 degrees clear of our enemy to the south-west.... We notice