Solar Edii*e of May 28, 1900. 



583 



In column 4 the predominating element in a group is put in italics. 



The sixteen images of the cusp and flash spectra obtained with the 

 reflecting spectrograph are in good focus throughout.* Each spectrum 



* The very strong chromosphere arcs, such as II and K, show a faint coma on 

 the more refrangible side. This has since been traced to slight irregular refraction 

 at the base of the 60 prism. The fault is, however, too slight to appreciibly 

 affect the definition of any but the strongest lines. 



