294 SPECIAL RESULTS IN THE URANOLOGICAL 



the disk appears in the form of Narben, or less bright than 

 the general surface. I prefer calling all brighter places on 

 the sun's disk " luminous cloud/' dividing them according 

 to their forms into masses and streaks. This luminous 

 cloud is distributed irregularly over the sun's surface, and 

 sometimes, when it shows itself most prominently, even 

 gives to the solar disk a marbled appearance. It is often 

 distinctly visible on the whole of the sun's margin, some- 

 times even up to the poles ; but it always appears most 

 strongly in the two zones which the spots more particularly 

 affect, and this even at times when there are no spots there. 

 On such occasions these two bright zones of the sun's disk 

 remind one vividly of Jupiter's belts. 



" Kidges are the less bright parts intervening between 

 the streaks of bright cloud, and showing always a shagreen- 

 iike aspect, reminding one of sand in which all the grains 

 are alike in size. On this shagreen-like surface we some- 

 times see extraordinarily small, faint, grey (not black) points 

 (pores), which are again traversed by exceedingly fine, dark, 

 small veins (Astr. Nachr., No. 473, S. 286). Such pores, 

 when in masses, form grey cloud-like spaces, and even the 

 penumbras of the solar spots. In these latter we see pores 

 and black points extend, mostly in radiating lines, from the 

 nucleus to the circumference of the penumbra ; and hence 

 arises the frequent agreement in form between the nucleus 

 and the penumbra." 



The explanation and connection of these varying pheno- 

 mena will perhaps first become known in their full import- 

 ance to the investigators of nature, when, at some future 

 day, and under the long-continued serenity of a tropical sky 

 during an interval of several months, there shall be ob- 



