These winds are in fact always the coldest
and most violent which we experience, and the hypothesis which we
have formed on that subject is, that the air, coming in contact
with the Snowy Mountains, immediately becomes chilled and condensed,
and being thus rendered heavier than the air below, it descends
into the rarefied air below, or into the vacuum formed by
the constant action of the sun on the open unsheltered plains.
The clouds rise suddenly near these mountains, and distribute
their contents partially over the neighboring plains.
The same cloud will discharge hail alone in one part, hail and
rain in another, and rain only in a third, all within the space
of a few miles; while at the same time there is snow falling
on the mountains to the southeast of us. There is at present no
snow on those mountains; that which covered them on our arrival,
as well as that which has since fallen, having disappeared.
The mountains to the north and northwest of us are still entirely
covered with snow; indeed, there has been no perceptible
diminution of it since we first saw them, which induces
a belief either that the clouds prevailing at this season do
not reach their summits or that they deposit their snow only.
They glisten with great beauty when the sun shines on them
in a particular direction, and most probably from this glittering
appearance have derived the name of the Shining Mountains."
A mysterious noise, heard by the party, here engaged their attention,
as it did years afterwards the attention of other explorers.
The journal says:
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