A M OX TH WITH THE MUIR GLACIER. qq 



No. 6 was 5,473 feet north, 70° east of C, and moved 232 

 feet from August 11th to September 2d in a direction south 

 6*3° east, or ten feet per day. 



No. 7 was 6.903 feet north, 59° east of C, and moved 89 

 feet between August 14th and August 24th, in a direction 

 south 3° east, about nine feet per day. 



No. 8 was 7,507 feet north, 62° east of C, and moved 265 

 feet from August 14th to August 24th, in direction south 56° 

 east. These last three points lay in one of the moraines on 

 the east side of the line of greatest motion and parallel with 

 it. These moraines are much interrupted in their course by 

 gaps. 



It is observable that these points are all east of the center 

 of the main line of most rapid motion, and are tending with 

 varying velocity toward the northeast corner of the inlet, 

 where the powerful subglacial stream emerges from below 

 the water-level. Doubtless, on the other side of the center 

 of motion, and at the same relative distance from the front, 

 the ice would be found tending toward the northwest corner 

 of the inlet, where a similar subglacial stream emerges. 



From these observations it would seem to follow that a 

 stream of ice presenting a cross-section of about 5,000,000 

 square feet (5,000 feet wide by about 1,000 feet deep) is 

 entering the inlet at an average rate of forty feet per day 

 (seventy feet in the center and ten feet near the margin of 

 movement), making about 200,000,000 of cubic feet per day 

 during the month of August. The preceding remarks upon 

 the many indirect evidences of rapid motion render the cal- 

 culation perfectly credible. What the rate may be at other 

 times of the year there are at present no means of knowing. 



The indications that the glacier is receding, and that its 

 volume is diminishing, are indubitable and numerous. The 

 islands of southern Alaska are ordiuarily covered with forests 

 of cedar, hemlock, and fir, up to the level of 1,500 or 2,000 

 feet above tide. But to this rule the shores and islands of 

 the upper part of Glacier Bay are a striking exception. Near 

 the mouth of the bay, forests continue to occur as in other 



