nting the rim of the crater,
and shooting down masses of ice into the great caldron. The length of
this glacier is about three miles, and its breadth about 4000 feet.
Another very lofty volcanic mountain is Mount Rainier, in the Washington
territory, consisting of three peaks of which the eastern possesses a
crater very perfect throughout its entire circumference. This mountain
appears to be formed mainly of trachytic matter. Proceeding further
north into British territory, several volcanic mountains near the
Pacific Coast are said to exhibit evidence of activity. Of these may be
mentioned Mount Edgecombe, in lat. 57 deg..3; Mount Fairweather, lat. 57 deg..20
which rises to a height of 14,932 feet; and Mount St. Elias, lat. 60 deg..5,
just within the divisional line between British and Russian territory,
and reaching an altitude of 16,860 feet. This, the loftiest of all the
volcanoes of the North American continent, except those of Mexico, may
be considered as the connecting link in the volcanic chain between the
continent and the Aleutian Islands.[5]

(_e._) _Lake Bonneville._--Returning to Utah we are brought into contact
with phenomena of special interest, owing to the inter-relations of
volcanic and lacustrine conditions which once prevailed over large
tracts of that territory. The present Great Salt Lake, and the smaller
neighbouring lakes, those called Utah and Sevier, are but remnants of an
originally far greater expanse of inland water, the boundaries of which
have been traced out by Mr. C. K. Gilbert, and described under the name
of Lake Bonneville.[6] The waters of this lake appear to have reached
their highest level at the period of maximum cold of the Post-Pliocene
period, when the glaciers descended to its margin, and large streams of
glacier water were poured into it. Eruptions of basaltic lava from
successive craters appear to have gone on before, during, and after the
lacustrine epochs; and the drying up of the waters over the greater
extent of their original area, now converted into the Sevier Desert, and
their concentration into their present comparatively narrow basins,
appears to have proceeded _pari passu_ with the gradual extinction of
the volcanic outbursts. Two successive epochs of eruption of basalt
appear to have been clearly established--an earlier one of the "Provo
Age," when the lava was extruded from the Tabernacle craters, and a
later epoch, when the eruptions took place from the Ice Spring