E. S. Holden— Reticulated Forms of the Sun’s Surface. 347 
seen were traced upon the screen by pencil lines and the result 
is shown in fig. 1. The representation is rough at best, but it 
has the merit of fidelity. As I was in doubt as to the meaning 
of my sketch and almost as to the real nature of the appear- 
ances, I enclosed it to Professor Langley and received from him 
the accompanying sketch, made July 25, 1873, at Allegheny, 
and a letter, a portion of which I quote with his kind permission. 
ageregations. Yet it cannot be said to be absolutely sure that 
this obscuration of detail may not occur in the sun itself and 
It is quite clear that there is an essential agreement here 
” 
fragmentary character. 
U. 8. Naval Observatory, Oct. 1, 1878. 
