66 PROCEEDINGS OF THE AMERICAN ACADEMY 



Upon this veiled spot could unmistakabh^ be seen a small black spot, 

 not a pore ; a real opening of both chromosphere and photosphere. 



On August 9, I observed another remarkable veiled spot within 

 about 10° from the north pole, and upon it could be seen three small 

 black spots. 



On August 13, at lib. Oin., I observed a ver_y dark veiled spot 

 within 6° or 8° from the north pole. It had upon it a group of small 

 faouhe, so characteristic of the spots of lower latitudes. At 4h. 3(hn. 

 in the afternoon, this veiled spot was still darker, and upon it, near a 

 facula, a pretty large black spot was visible. 



On August 24, I observed a remarkable veiled spot at about 75° 

 south latitude. 



On September 6, another large group of veiled spots was seen 

 within lO'* or 15° of the north pole. At lOh. 20m., some faculte had 

 formed upon it, and two black spots were distinctly visible. At 

 5h. Om. in the afternoon, this group was still visible. 



On September 8, within a few degrees of the north pole, I ob- 

 served a fine group of two veiled spots, unusually dark and large, and 

 near one of these spots there was a pretty large and bright facula. Ten 

 minutes later the dark veiled spots liad vanished, leaving in their place 

 some bright faculjB. One minute later the veiled spots began to re- 

 appear, but under another form, to disappear again the next moment. 



A little south-west from this last group, but in the same field of 

 view, was another group of veiled spots apparently in full activity. 

 Upon it three or four black spots were visible for some seconds. 

 Upon these veiled spots the granulations had an extraordinary mobil- 

 ity ; so much so, that I expected at every moment to see a large spot 

 make its appearance, but in less than a minute the veiled spots and 

 the black spots had both vanished, and in their place were formed in 

 an instant, .some very bright facuke. 



To all appearances, the v^eiled spots seen in high latitudes differ but 

 ver}' little from the oi'dinary sun spots of the lower latitudes, except 

 in regard to magnitude and activity. The difference seems particu- 

 larly to be that, in the first, the umbra, instead of being freed from the 

 gases and vajwrs, is partly or wholly choked with them ; while, be- 

 sides, the chromosphere covers it. The forces which open the photo- 

 sphere in higli latitudes, it would seem, have not sufficient energy to 

 repel or dissolve tl)e chromospheric gases ; or, if tliey have, it is in a 

 very feeble degree, but, even then, the phenomenon is generally of 

 short duration. 



Though I had no means of making accurate measurements of the 



