368 Scientific Intelligence. 
and graphic record as could not fail to attract the attention and obtain 
the confidence of the astronomical world. It should be remembered that 
the Observatory in question is not an institution endowed with ample 
funds to meet all its requirements, but that, on the contrary, appeals for 
aid to patriotic citizens have frequently been necessary, and have always 
been generously responded to whenever any object of scientific import- 
ance could be thus advanced.’ ‘ 
Passing from this splendid addition to our knowledge of the physical 
phenomena of comets, Mr. De La Rue next referred to a very important 
step made by Professor Bond in connection with the theory of planetary 
perturbation, ‘It is well known that when the excentricity and inclina- 
tion of the orbit of the disturbed planet are considerable, the problem of 
three bodies represents difficulties which have baffled the efforts of the 
most consummate mathematicians since the time of Newton. Fortun- 
pendently of and simultaneously with Mr. Lassell; and, in the secon 
place, observations of a peculiar luminous appearance within the then 
bright rings on the ball, which shadow was seen at the same time 10 its 
proper place. I need scarcely say that it was the dusky ring of —_ 
that was then for the first time noticed, though it was only ons 
tecognized as such when, on Nov. 15, 1850, Mr. Tuttle, of the Harv 
acter would explain the phenomena. Mr. Daw 
on the 25th and 29th of the same month, discovered the natn The 
independently, with a refractor by Merz, of 64 inches aperture. © 
address concluded as follows:— ak 
‘I believe I am right in stating that the only orbit of Hyperion ye 
published was computed by Professor G. P. Bond, from his own obser- 
