346 EH. S. Holden—Reticulated Forms of the Sun’s Surface. 
Art. XL.—WNote on the Reticulated Forms of the Sun’s Surface ; 
by Epwarp S. Hotpen. Communicated by permission of 
Rear Admiral John Rodgers, Supt. U. S. Naval Observatory. 
On September 16 and succeeding days a watch was kept on 
the sun’s disc, at the request of Professor Watson, for a possible 
transit of Vulcan. 
ust before noon of September 16, Professor Eastman called 
my attention to certain cloud-shaped forms on the sun’s dise 
which were visible when the sun’s image, seen by projection, 
was allowed to move across a white screen. This was with the 
inches from the focal plane and the shadows of the micrometer 
wires (which were placed 100” apart) gave a scale of reference. 
and Langley. The area bounded by these lines was not seen 
filled by the smaller forms of Janssen. These dark lines when 
