166 -W. A. Norton— Coggia’s Comet. 
were shown in the drawings made by Mr. Huggins and Mr. 
Christie. They are also to be seen in Mrs. Newall’s drawing 
(see cut, p. 165), and they were described by Mr. Lockyer in a 
letter published in the Times, of July 16th, on the structure of 
the comet. When the comet was again visible in the Southern 
hemisphere, the inner duplicate structure was still visible, but 
the outer ares had been dissipated.” The duplicate structure 
here referred to is a highly significant fact. That it may be 
uly appreciated it must be borne in mind that at the period 
when this structure was observed, the line of sight from the 
earth to the nucleus was inclined under a small angle to the 
since the ere contrast between the dark space behind the 
nucleus and 
