we steered south down a small grassy valley; the hills with granite bases
and sandstone table summits, with excellent grass, and thinly wooded with
acacia and a few York gums. At 3.15 bivouacked in a patch of excellent
grass with water in small quantities.

24th October.

A violent thunderstorm during the night was followed by a rainy and misty
morning; the weather clearing up, we walked down to the Chapman River,
which was running in a sandy channel with small shallow pools. The land
on the bank of the stream was very indifferent and sandy for about a
mile, when it rose into granite and sandstone hills, covered with
excellent grass.

EFFECT OF REFRACTION. GREENOUGH RIVER.

25th October.

Accompanied by Messrs. Burges and Walcott, I proceeded to examine the
country to the eastward of our camp. Starting at 7.20 a.m., steered east
over grassy hills, with granite bases and table summits of red sandstone,
the latter rock forming but a poor soil with scanty feed and scrub;
crossed several small gullies running into the Chapman. At 10.0 passed a
large sandy hill, covered with short scrub, and halted at 11.0 in a
grassy gully in the bottom of a wide scrubby valley; at 12.45 p.m. again
resumed our journey, and ascending the sandy downs, at 1.15 gained the
highest ridge. Before us lay the valley of the Greenough River; the white
and red sandstone cliffs, which bound the valley on the south-east, were
distorted by excessive refractions, which, as we crossed each sandy
ridge, changed their appearance, sometimes assuming the appearance of