234 



Further Observations on Nora Persei. 



the two inner maxima is 200 per second. We thus have indications 

 of possible rotations or spiral movements of two distinct sets of 

 particles travelling with velocities of 500 and 100 miles per second. 



A similar examination of the E and G lines of hydrogen in the 

 photographs obtained with the 30-inch reflector has also been made by 

 Dr. Lockyer, and the light curves for the G line are here illustrated 

 (fig. 2). In this longer series the most important point comes out that 



• » /w\An 



/n 



M 



Fig. 2. — Light cur re of Hy (30-incli reflector). 



the maximum intensity changes from the more to the less refrangible 

 side of the bright hydrogen line. 



The small dispersion given by the 30-inch prevents some of the 

 details recorded by Messrs. Baxandall and Shaw from being seen. 



So far as the observations have gone, they strongly support, in my 



5. 



" 5. 



105. 104 



106. 107. 106 



III HO. 109 



112 



113 



114 



