OF ARTS AND SCIENCES. G") 



opened tlirongli the chromosplicn' upon the i^ronp of v('ilc<l spots 

 observed in the nioniiuL:. At Sh. Oin. on the tollo\vin<f nioniini;. the 

 group of small bhu-k spots was considerably increased, havin;^ cpiitc a 

 large spot on the [)receding side, followed by twelve; or fifteen smaller 

 ones. On June 24, this group had attained to its maximum size. 

 It was then very large and complicated. In fact, it was the largest 

 group of sun spots observed thus far during the presetit year. 



On August 8, I noticed a group of veiled spots a little south of 

 the sun's centre. The following morning at 7h. Om,, there was at 

 the same place a small group of half a dozen black spots disposed in a 

 crescent shape. At 2h. Om. p.m., the black spots had vanished, but 

 the veiled spots still remained, having retained the characteristic 

 crescent form of the black spots and many other details observed in 

 the morning ; and, as a proof that the chromosphere covered this spot, 

 t/ie granulutions could be j)lainJy seen upon the tv/iole, indicating 

 clean-ly tJiat this spot was seen through the veil of the chromosphcric 

 gases. 



On August 24, the same phenomenon took place. Just following the 

 principal spot of the only group then to be seen on the surface of the 

 sun, there was a fine group of veiled spots. The following day some 

 bladi spots had made their appearance upon them. On August 27, 

 the black spots had vanished, but in their place the veiled spots seen 

 at first still remained, and they continued to be seen there for several 

 days. 



To all appearances, the black spots which I had seen disappear 

 under the chromospheric gases, and which continued as veiled 

 spots, were exactly alike and undistinguishable from the many other 

 veiled spots scattered all over the sun ; and, had I not seen the open- 

 ing of the photosphere, with the black spots, I could not have had any 

 idea of the true nature of the veiled spots. 



So far, I have oidy spoken of veiled spots observed in the zones 

 where the ordinary sun spots make usually their appearance ; but, as I 

 have said, the veiled spots are scattered all over the surface of the 

 sun. 



During this period, I had many occasions to observe very remark- 

 able and characteristic veiled spots in very high heliographic latitudes 

 north and south. On July 15, within a few degrees of the north 

 pole of the sun, I observed a remarkable veiled spot, unusually large 

 and dark. Upon it were several bright slender facuhii projected in 

 crest shape to very high altitudes. These faculae appeared to be pre- 

 cisely like those observed in lower latitudes near ordinary sun spots. 



VOL. XI. (N. S. 11.) 5 



