whilst the former part of the communication was in the press. 391 
No. VII. R. A. 9 h i 9 ra ; Decl. 9 0 50' N. 
6j 9 Leonis ; I. 26 ; S. 600. 
Double ; 6th and 9th magnitudes ; small, pale blue. 
Sloane-street ; February 12 , 1826 ; Seven-feet Equatorial. 
Position = 64° 14' sf | 6 Obs. | DifF. = 4 0 42'. Excessively difficult. 
The small star only visible by glimpses ; observations made on the meridian, 
with 787 ; the extreme unsteadiness of the stars renders it impossible to procure 
any measures of distance, and those of position must be received with caution. 
The unfavourableness of the weather has not allowed me 
to procure other measures of this difficult star. Sloane-street? 
March 18, 1826. 
The position April 4, 1783, was measured with a 20-feet 
reflector, 12 inches aperture, and found to be 20° 54' sf The 
change is very great, no less than 43 0 20' in 42.8 years, or 
almost precisely a degree per annum. There can be little 
doubt, therefore, that this very curious double star is entitled 
to a place among the revolving stars or Binary systems. 
The uncertainty of the present observations, arising from the 
difficulty of the star, and the unfavourable weather, might 
render us cautious in admitting this conclusion ; but a series 
of well-agreeing measures by Mr. Struve, on four nights, 
from Feb. 25, to April 4, 1825, which give a mean result 
63°. 7 sf sufficiently establish the fact. These interesting 
observations are contained in a letter from Mr. Struve, dated 
April 21, 1825. (H.) 
JAMES SOUTH. 
132 Sloane-street, April 7th, 1826 . 
