A GREAT SOLAR OUTBURST. 



2OI 



cordant determinations gave 7' 49" as the extreme 

 altitude attained ; and I am particular in the statement 

 because, so far as I know, chromatospheric matter (red 

 hydrogen l in this case) has never before been observed 

 at an altitude exceeding 5'. The velocity of ascent 



Fio. 2. 



also, 167 miles per second, is considerably greater than 

 anything hitherto recorded. A general idea of the 



1 Prof. Young probably means that he was observing the red image 

 of the cloud and uprushing matter i.e. the image formed by rays cor- 

 responding to the C-lino of hydrogen. Father Secchi mentions that he 

 finds the indigo image (i.e. the image formed by rays corresponding to 

 the G-line of hydrogen) the most perfect and the fullest in details. 



