Journal of Geology, Vol. XXV, No. 4 



Plate III 



d 



a, showing a later stage, at 10:00 a.m., in the spread of the fume cloud of May 19, 1916. 



b, showing the fume cloud above the head of flow at 8:30 a.m., May 22, 1916, as seen at a distance of 

 30-35 miles, in a direction S. 66° W. from the Hawaiian Volcano Observatory. 



c, showing the brightly illuminated arch, or "primary glow," above the source, and the course of the 

 Honomalino stream, as seen just before midnight, May 22, 1916, at a distance of about 10 miles in a direction 

 about N.N.W. from near Kahuku. This illuminated band or arch was about 7 miles in length and about 

 I mile in height. Besides it, a bright, diffused red glow covered the entire clouded sky — an effect not shown 

 by the view. 



d, a view from the Hawaiian Volcano Observatory exposed from 1:15 to 1:45 a.m., May 25, showing the 

 illuminated fume cloud above Kilauea (lower left) at a distance of 25 miles from the camera, of about 1,500 

 feet spread, and the illumination above the Kahuku stream (upper right), partly hidden by clouds at the 

 south, distant 30-35 miles, with a spread of about 5 miles and a height of a little less than i\ miles at 

 maximum. 



