160 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1914. 
develop the magnetic fields and which the theory of Emden so nicely 
predicts. 
Very recently these researches have been extended and it is thought 
that the evidence shows that there is about the sun a magnetic 
field analogous to that about the earth. We have just spoken of this 
in connection with the corona, but it should be further manifested both 
in the Zeeman phenomena and the helicoidal movements in the prom- 
inences. These experiments are not at present fully completed and 
their discussion is in progress. We just call your atteation to them. 
In the case of the sun, where so to speak, all the resources of modern 
physics have been given rendezvous, we find ourselves very far from 
the huge ball of fire which our fathers naively believed they saw. 
There is no doubt that we have to do with one of the most powerful 
creative organs of nature and the more we advance the greater the 
-mysteries seem to become. Fortunately this is only apparently so. 
As science advances, new questions appear before indeed the older 
ones, often badly put, are solved. But the latter often lose their 
interest, and as we proceed many untenabie hypotheses which dark- 
ened our path are destroyed. And so, little by little, the knowledge 
we have of things progresses with a tidal motion which will doubtless 
end only with humanity. 
