he hill-side, while the falling veil cloud clings to it close
all the way down;--and lastly the throned cloud, which rests indeed
on the mountain summit, with its base, but rises high above into
the sky, continually changing its outlines, but holding its seat
perhaps all day long.

These three forms of cloud belong exclusively to calm weather;
attached drift cloud, (see Note 11) can only be formed in the
wind.]

[Footnote 10: 'Glaciers of the Alps,' page 10.--"Let a pound weight
be placed upon a cube of granite" (size of supposed cube not
mentioned), "the cube is flattened, though in an infinitesimal
degree. Let the weight be removed, the cube remains a little
flattened. Let us call the cube thus flattened No. 1. Starting with
No. 1 as a new mass, let the pound weight be laid upon it. We have
a more flattened mass, No. 2.... Apply this to squeezed rocks, to
those, for example, which form the base of an obelisk like the
Matterhorn,--the conclusion seems inevitable _that the mountain is
sinking by its own weight_," etc., etc. Similarly the Nelson statue
must be gradually flattening the Nelson column, and in time
Cleopatra's needle will be as flat as her pincushion?]

[Footnote 11: 'Glaciers of the Alps,' page 146.--"The sun was near
the western horizon, and I remained alone upon the Grat to see his
last beams illuminate the mountains, which, with one exception,
were without a trace of cloud.

"This exception was the Matterhorn, the appearance of which was
extremely instructive. The obelisk appeared to be divided in two
halves by a vertical line, drawn from its summit half-way down, to
the windward of which we had the bare cliffs of the mountain; and
to the left of it a cloud which appeared to cling tenaciously to
the rocks.

"In reality, however, there was no clinging; the condensed vapor
incessantly got away, but it was ever renewed, and thus a river of
cloud had been sent from the mountain over the valley of Aosta. The
wind, in fact, blew lightly up the valley of St. Nicholas, charged
with moisture, and when the air that held it _rubbed against the
cold cone_ of the Matterhorn, the vapor was chilled and
precipitated in his lee."

It is not explained, why the wind was not chilled by rubbing
against any of the neighboring mountains, nor why the cone of the
Matterhorn, mostly of rock, should be colder than cones of snow.
The phenomenon was first described by De Saussure, who gives the
same explanation as Tyndall;