L. Trouveht— Veiled Solar Spots. 173 



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 11^ 0™, I observed a very dark veiled spot 

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

 small faculae, so characteristic of the spots of lower latitudes. 

 At # 30'" 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 10° or 15° of the north pole. At 10'' 20™, some faculae 

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

 At b^ O'" in the afternoon, this group was still visible. ^ 



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

 observed 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 had 

 vanished, leaving in their place some bright faculae. One 

 minute later the veiled spots began to reappear, but under 

 another form, to disappear again the next moment. 



A little southwest 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 granulation had 

 an extraordinary mobility ; 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 faculse. 



To all appearances, the veiled spots seen in high latitudes 

 difiFer but very little from the ordinary sun spots of the lower 

 latitudes, except in regard to magnitude and activity. The 

 diflFerence seems particularly to be that, in the first, the umbra, 

 instead of being freed from the gases and vapors, is partly or 

 wholly choked with them; while, besides, the chromosphere 

 covers it. The forces which open the photosphere in high 

 latitudes, it would seem, have not sufficient energy to repel or 

 dissolve the chromospheric gases; or, if they 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 positions of the spots seen in high latitudes, the error of ray 

 estimation cannot be very great. In any case a few degrees 

 would certainly cover it, and it remains a fact that I have ob- 

 served spots at least within 10° of the north pole of the sun. 

 The importance of this observation will appear when it is stated 



