a variety of pitchstones and spherolitic rocks. The amy- 
gdobs ranging from 1/2 an inch down. There were the harder 
gray purple and yellowish trachites without number. Lunched. 
Let this morning Jack Burnett and his English party. 
Beyond the lake we came upon open country with 4ome dead 
and young timber. Here Howard had camped. A' little farther 
on we came upon a large sulphur spring bus in- -covering perhaps 
one mile square. In a depression near the center is a sulphur- 
lake of irregular slope --some 200 yards in length. The water 
is of yellowish milKy color. All around the slopes of the 
basin are sulphur vents--the whole surface veing worked 
over and coated or spotted with yellow sulphur. There are 
scattering trees over the basin. Parks opening out to 
Alum Creek. These springs are at the head of Alum Greek. 
The underlying and frequently outcropping and much weathered 
rock is a coarse grayish loosely compacted gray trachyte with 
a slight tending to the spernlike structure. A mile below 
the Sulphur Lake we descend into a little glen in which are 
some sulphur vents and an outcrop of dark rock on the right, 
found the rocks gradation forms between trachyte and pitchstone. 
A purpled gray and heavy trachyte with slight tendency to the 
spherolitic texture occurred also. M asses of coarse grained 
pitchstone with spheres 1/2 inch in diameter having radiating 
structure; grades of rocks between these two were noticed. 
Some of the masses which here had large spheresules ha „ ^ 
rotted mid weather -like coarse cellular basalt or even cinders. 
From this glan we soon came out upon the open hills, the 
