THE ORIGIN AND DEVELOPMENT OF THE EARTH L1y 
FIGURE 6. 
An eruptive prominence of the sun, photographed at Yerkes Observa- 
tory on March 25, 1910. This prominence is but one of the many that 
are constantly being shot forth from the surface of the sun, rising 
many thousands of miles above its surface, and traveling at a speed of 
hundreds of miles per second in some cases. 
FIGURE 7. 
The same prominence shown in Figure 6, photographed 43.2 minutes 
later. The ynmense size of the prominence, and the great speed which 
it possesses may be judged by comparison with the previous figure, 
and with the curvature of the visible portion of the sun’s outline. 
Photographed at the Yerkes Observatory. From Chamberlin, University 
of Chicago Press. 
