352 



Mr. William J. S. Lockyer 



[March 1, 



conclusion that sunspots at such a low latitude can originate coronal 

 streamers so distant as the solar poles. 



It must not be forgotten that a study of the frequency of solar 

 prominences has disclosed the fact that not only have these pheno- 

 mena a periodicity of about eleven years, synclironizing exactly with 



-^-'v't^'v^Ja/v 



Pig. 1. — Curves to show that while the Different Forms op the 

 Corona Exhibit a EegudaH Variation, Corresponding in Time 

 TO those op Sunspot Areas and Prominence Frequency, it is 

 THE Prominences (which, unlike the Spots, are not limited 

 TO any Latitude) that are Responsible for the Varying 

 Systematic Changes op Form op the Corona. 



the spotted area, but that when their frequency is at a maximum, 

 they are conspicuous at the highest solar latitudes. Thus there 

 occur at the same time prominences and coronal streamers near 

 the solar poles, a very possible and probable condition for cause and 

 effect. 



In the eclipses of 1901 and 1905, several striking photographs were 



