254 CAMPBELL— CROCKER ECLIPSE EXPEDITION. 



Eclipse Expeditions to Sumatra, Spain, and Flint Island, it seems 

 sufficient to let the progress of this problem in the immediate future 

 depend upon the Einstein photographs of the sun's surroundings. 



Other Eclipse Problems. 



Many other eclipse problems, perhaps of lesser importance from 

 the astronomical point of view, cannot be considered here for lack 

 of time. It is hoped that enough ha's been said to show that total 

 solar eclipses have raised difficult and interesting questions. 



Lick Observatory, 



University of California. 



