OF ARTS AND SCIENCES. G5 



opened through the chromosphere upon the group of veiled spots 

 observed in the morning. At 8h. Om. on the following morning, the 

 group of small black spots was considerably increased, having quite a 

 large spot on the preceding 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 largt-st 

 group' of sun spots observed thus far during the present 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 cliaracteristic 

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

 the morning; and, as a proof that the chromosphere covered this sj)ot, 

 the granulations could be plainly seen upon the ivhole, indicating 

 cleaniy that this spot ivas 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 

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

 the black spots had vanished, but j[^i 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 cliromospheric 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 only spoken of veiled spots observed in the zones 

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

 bave said, the veiled spots are scattei-ed 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 faculaj projected in 

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

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



VOL. XI. (n. S. II.) 6 



