whilst the former part of the communication was in the press. 391 



No. VII. R. A. 9M9" ; Decl. 9° 60' N. 



cJ^ 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° 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° 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°.? 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. 



