explosions. During the night of the 8th a nearly inaudible 
fountain of incandescent material rose and fell for hours, not 
once dying down completely. The next morning enormous bombs 
showered the west side of the crater, one of which, 2 meters in 
diameter, was observed to lan-.- at the west base. The silent 
phase this time continued until the 15th, accompanied by appreciable 
amounts of new ash, which was deposited to the 'west, and by a sound 
varying fro® that of beating surf, on the 12th, to complete silence 
on the 13th end 14th. 
On the afternoon of the 15th the loud continuous roar so 
B 
well known by now began again. Xy the 18th the characteristic**** 
bhttish vapors were tinged with yellow again, ana short cessations 
of the roaring noil© were accompanied by shower* of amll bombs 
fa* 
The following altitude deter tnations of the crater made on 
September 16 hernia be compared with those on figure 2t east pear 
2750.9, west peek 2747.6, north inner rim k 726.3. 
A visit to the con# on September 18 revealed that the west 
base had been blanketed with 10 centimeters of new ash in the 
previous three weeks, covering bomb fragment! and the adjacent 
lave. The central explosive vent, which originally occupied a 
ridge-top position between the broader northeast and southwest 
vents had grown very broad ana deep. The depression marling the 
d 
efimet northeast vent had disappeared altogether, as had 
ridge between it and the southwest vent. Three eruptive threats 
were still in evidence, however. On a narrow shelf part way 
up the side of the great central throat, thin slow-moving whit© 
vapors drifted up from the nearly destroyed old southwest vent, 
find on a yet narrower bench across the central throat to the north- 
