1826.] hy the Council of the Astronomical Society. 443 



suspected. It is no way offensive, and can certainly not be 

 called a serious defect, and might arise from imperfect adjust- 

 ment. In every other respect the definition of this star, with 

 the power mentioned, was excellent. 



w" LeoTiis is one of the most difficult double stars in the 

 heavens. With 220 it was seen elongated : with 700 it was 

 distinctly seen to consist of two discs in apparent contact. With 

 this high power, a slight degree of diffusion in the light of the 

 slars was perceptible, but on the whole the performance of the 

 telescope was extremely good. 



f Cancri was examined with 300, 450, and 700. With the 

 lowest power it was seen triple, very beautifully defined, and the 

 close stars distinctly separated. With 450 they were well sepa- 

 rated, and the black interval distinctly seen. With 700 the 

 separation remained perfectly distinct. 



A minute star was suspected near a- Cancri; but on compar- 

 ing the diagrams made of it with its real position, it could not 

 have been the true companion of that very difficult double star, 

 which to be perceived requires the full power of reflectors of the 

 largest class. 



The companion of Polaris was of course perfectly well seen. 

 The light of this telescope is, however, amply sufficient for 

 showing the nebulee of Sir W. Herschel's first class. Several of 

 these were examined, and the high degree of concentration of 

 the rays in the focus, arising from the absence of aberration, 

 proved very valuable, and was evidently marked in the resolvable 

 appearance exhibited by them. 



Saturn was shown with great distinctness, the division of the 

 ring, and the three interior of the old five sateUites being plainly 

 seen. A satellite on the body of Jupiter was also seen as well as 

 its shadow ; and the planetary discs of the other satellites could 

 not be mistaken for spurious ones. 



Your Committee consider that the facts above detailed speak 

 sufficiently for themselves as to the excellence of the telescope 

 to render comments or praise on their part superfluous ; but they 

 cannot close this report without observing once more on the great 

 pains bestowed on its workmanship by Mr. TuUey, and his 

 address in availing himself of the resources of his art in operat- 

 ing on a material which might certainly in the beginning be 

 regarded as highly unpromising. 



(Signed) G. Dollond. 



J. F. W. Herschel. 

 May 12, 1826. W. Pearson. 



The report alluded to above : — 



At a meeting of the Committee of the Astronomical Society 

 for reporting on the propriety of purchasing specimens of 

 M. Guinand's glass for further trials, held March 17, 1823. 

 The telescope constructed by Mr. Tulley was produced and 



