Miiir Ghxcier Region. Ahixkn. — ('n-sf,!)u/. "217 
and prolonged matter. The evidence fnrnished In' the stria? is of 
a recent and rather rapid retreat of the glacier from a condition 
of much greater extent. 
Conditio)! of the Efiitfcni poi-fion of flu: fjhicier. — Tnis has 
already lieen treated in consideraltle detail. The evidence there 
presented of the great decadence of that portion of the glacier 
will readily be recalled. 
La ml slip (III fJic W/ilfr glticlrr. — The extension of the White 
glacier into the main amphitheatre is clearly marked by its very 
white color and the heavy moraine at its outer side. It ends in 
front of the Dirt Glacier valley. About two miles above its end 
its entire l)readth is covered for a short distance by a coating of 
loose debris, which increases in thickness and coaresness toward 
the mountain side, upon which masses of the same material lie. 
Some sudden flood or avalanche has hurled this mass of material 
down the mountain side, and scattered it l)roadcast over the sur- 
face of the ice. The present surface of the ice covered !)y this 
material now stands well a)»ove the level of the ice not so pro- 
tected, and presents the characteristic surface of ice so covered; 
great differences of level appear according to the thickness of the 
covering, with the prevalent tendency toward the production of 
sharp ridges and cones. To produce the existing difference of level 
and character of surface exhibited, a length of time would Ije nec- 
essary which must at least be measured in months. Yet the materia! 
lying on the glacier is directly continuous with that on the mount- 
ain side, so that little movement can have taken place since the 
slide occurred. 
THE DVIXCi (iL.VCIER. 
The Dj-iug glacier lies in a valley from half a mile to a mile 
wide, which extends from the western shore of Muir inlet through 
the mountains to Glacier bay. The glacier is a mass of ice nearly 
three miles long, of unknown thickness, occupying the middle 
third of the valley. From its eastern end a stream flows into 
Muir inlet, three and one-half miles distant, through the soft de- 
posits occupying this jwrtion of the valley. Tlic western end of 
the glacier lies very close to tide water from (J lacier bay which ex- 
tends up the valley for two miles and a half. The highest point 
of the ice, about 800 feet A. T., is near the centre. From this 
point the surface slopes evenly in l)oth directions. Two small 
glaciers, the one north of Pyramid peak, and one from the .soutii 
