414 
ME. WAEEEN DE LA ETJE ON THE 
It is known that Senor Aguilae, Professor Montseeeat, and Father Secchi obtained 
photographs of the eclipse at Desierto de las Palmas, south of the central hne, whilst 
my own were taken on the north of it. The latitude of my position was 42° 42' N., 
that of Senor Aguilae 40° 4' 4" N. ; my position, measured on a meridian, is about 
18' north of the central line of the eclipse, Senor Aguilae’s about 4' to the south of the 
central line. 
Senor Aguilae was so good as to send me paper copies of the four photographs taken 
at Desierto de las Palmas ; and I have been able, in return, to send him copies of mine 
on glass, 9 inches in diameter. 1 have enlarged the copies presented to me to exactly 
the same dimensions (9 inches for the moon’s diameter). One amongst the number, 
namely, the first taken, is sufficiently good, when magnified, to admit of measm-es 
being made on it with a fair amount of accuracy, although there is evidence, in the 
woolliness of the photograph, of the telescope not having followed the sun very vreU. 
Notwithstanding a want of precision in the details, I was able to ascertain with certainty 
that the distances between the point r' of E, and a of A, between a of A and c of C, 
between c of C and g of G, between ^ of G and ^ of I, and between i of I and of K, in 
Senor Aguilae’s photographs, correspond exactly with the same points in mine. 1 have 
already mentioned that when my first totality negative was superposed over the second the 
several prominences exactly coincided in their relative positions, and that the distance 
between any given points of two prominences on my first totality-photograph is abso- 
lutely the same in the second totality-photograph. Here we have the evidence carried 
still a step further ; for the distances between given points in two prominences in Senor 
Aguilae’s photographs accord entirely with the distances between the same points on 
my own. 
I may mention that the prominence G in Senor Aguilae’s photograph, from the 
commencement of the broad part on towards h of the fallen tree H, is much confused : 
H is not seen, because it is mixed up with G, which in consequence is as broad from h 
to g' as in its broadest part. With this explanation, however, there will be experienced 
no difficulty in comparing the photographs. The boomerang is not depicted on Senor 
Aguilae’s photographs. As my position was north of the central line, and the moon’s 
centre was, as we have seen, shifted, by parallax, about 12" below the sun’s, it follows 
that I ought to have seen more of the prominence A, and less of I and Iv, than could 
be seen at Desierto de las Palmas ; this is fully borne out by the photographs taken at 
the respective localities. The height of A above the moon’s periphery is 40" in my 
first totality-picture ; in the corresponding picture taken at Desierto de las Palmas it 
is 32", the difference being 8". Prominence K in my first totality-picture, measured 
at i^', is 44", in Senor Aguilae’s 60", difference 16". The mean of the two measures 
— 2 — = 12", the relative parallactic displacement of the moon’s disk at the two stations 
of Eivabellosa and Desierto de las Palmas, ascertained as nearly as the want of defi- 
nition in the photograph obtained at the latter station permitted. It is probably less 
by about 2" than the true displacement. 
