1864] 



and Secchi's Eclipse Photographs. 



443 



of procuring more satisfactory prints from the original negative of the first 

 phase of totality, yet some advantage would arise from taking an enlarged 

 negative from the positive print in his possession, although it could not 

 be expected to yield as perfect an impression as might have been obtained 

 by enlarging from the original photograph. The enlargement has been 

 successfully accomphshed in my presence ; and although Professor Secchi 

 Vfill take such means as he may think proper to make known the results 

 of comparisons he may make between my photographs and his own, it 

 will not be out of place for me to add a few remarks by way of appendix 

 to my paper. 



Taking the prominences in the order in my index map, Plate XV. : — 

 Prominence A (the cauliflower or wheatsheaf) has the same form in 

 Padre Secchi' s photograph as in mine. It extends considerably less in 

 height above the moon's edge in this copy than in that printed off from the 

 strengthened negative (Senor Aguilar's copy) ; the bright points of the 

 two branching streams which issue from the summit towards the North are 

 well depicted in the Secchi photograph, but not the fainter parts. 



There exists a faint indication of the minute prominence B in the S. 

 photograph. 



The convolutions of the prominence C (the floating cloud) are seen in 

 the S. photograph, and its form coincides absolutely with 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, pro- 

 bably 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 extremity h, the 

 round points h' h", the point h'", and the connecting branch joining it with 

 the stem are clearly seen. 



The prominence G from ff]'to g' corresponds precisely in the S. photo- 

 graph 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 hi 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 olf 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 visi- 



