138 Scientific Intelligence. 
ment of the prominences upon the disk of the moon as seen in the photegraphs. 
This —— appearance, instead of being due to “ soca reflection ” is wholly a 
dark-room phenomenon, as will be saptalve | in the te 
That Dr. Curtis’s explanation is Bagh adequate in most cases 
we readily concede, But when Ulloa in 1778 saw the brightness 
of the —- projected so ‘ei ses the lunar disk that he 
thought the sun was shining through a hole in the moon, there 
were no phabogeuphe And had circumstances brought to Dr. 
Curtis’s notice as many dozens of cases as have come to our knowl- 
. Curtis has Am given the results of some interesting experi- 
ments made to determine the origin of th glow seen upon the sun, 
oe the moon’s limb, of the photographs; a glow which has 
und real and not the result of contr ast, in all the impres- 
sions bakes last August. This he believes to be a result of diifrac- 
tion, a view which we fully shared, as those present at the August 
session of the National Academ my will remember. And b experl- 
ments involving diffractive action, he has one so he eclipse- 
he 
unaware, settled the question some time since by the promoceea of 
other artificial eclipse-pictures by methods which exclude di 
tion, yet manifest the crepuscule as clearly as in the original acd 
‘ ble nes 
possession, and Prof. Morton found the explanation of the phenom- 
— in a local redevelopment of the negat ive. -This explanation 
a to account for Dr. Curtis’s results as well as for his 
ried out with his Sissnstees stic ability, se ation is no-sanen” 
wanting to us a full-description of his paper. Among other 
things, he measured the dimensions of two of the a t 110"; 
s protu 
e = G0) ae where is Gilman had seen a might ‘double 
