Mr. De la Rue's and Father Secchi's Eclipse Photographs. 479 



that of mine; it is a little nearer the moon's edge at the point c, 

 probably because the telescope was uncovered relatively a little later 

 than at Rivabellosa. 



The prominence D cannot be clearly traced in the S. photograph. 



The boomerang E is distinctly visible in the S. photograph ; the 

 point e is apparently prolonged ; but this I attribute to an accidental 

 photographic stain, for the bright part e' can be well made out. 



The long prominence F cannot be made out in the S. photograph, 

 probably from the cause explained in reference to C. 



The fallen tree (H in the S. photograph) corresponds in its 

 minutest details with its picture in my own. The articulated extre- 

 mity h, the round points h' h", the point h f ", and the connecting 

 branch joining it with the stem are clearty seen. 



The prominence G from g to g corresponds precisely in the S. 

 photograph with its image in my own, and a dark marking near g 

 also is seen ; the narrow portion of this prominence, from g to the 

 point immediately below A, is not seen in the S. photograph. 



The prominence I (the mitre) agrees in form in the S. photograph 

 with its image in my own, even the faint point z is there seen. This 

 prominence in the S. photograph extends further from the edge of 

 the moon than in mine ; and whereas in my photograph the convex 

 boundary next the moon is cut off by the ^moon's limb, in Padre 

 Secchi's the convex boundary is complete, and hence in all probability 

 the prominence I presented another case of a floating cloud. 



About midway between G and I there is a small round prominence 

 visible in the S. photograph not seen in mine, which may be accounted 

 for from our different positions in respect to the central line of the 

 eclipse. 



Between I and K, at a distance from I equal to about two-thirds 

 the angular interval, there is in the S. photograph a prominence con- 

 sisting of two round dots, which extend beyond the moon's limb 

 to precisely the same extent as the prominence K protrudes in Pro- 

 fessor Secchi's photograph beyond the moon's limb in excess of 

 what it does in my own. 



The prominence K has precisely the same form in every respect in 

 the S. photograph as in mine, so far as mine shows it ; but on account 

 of parallax, more of it is seen in the S. photograph than in mine. 



Beyond K is another prominence, visible in the. S. photograph about 

 1 7° distant from K, a small round prominence which could not have 

 been visible from my station. 



Of the remaining prominences, L, M, N, O, P, Q, R, none were 

 visible at the epoch of the photograph. 



In conclusion, the photographic images of the prominences, so far 

 as they are common to the two photographs taken at Miranda and 

 Desierto de las Palmas, accord in their most minute details. The 

 photographs must, from the difference of position of the two stations, 

 have been made at an absolute interval of about seven minutes ; and 

 this fact, while it strongly supports the conclusion that the protu- 

 berances belong to the sun, at the same time shows that there is no 

 change in their form during an interval much greater than the whole 

 duration of an eclipse. 



