Astronomical Society. 377 
Mr. Herschel, M. Struve, says, “* You may easily imagine with 
what interest I have perused the work on double stars, by your- 
selfand Mr. South, and with what pleasure I found that, inde- 
pendently of one another, we have arrived at the same results 
and deductions.. Although my instruments were formerly in- 
ferior to yours, with respect to measurements (as I could only 
observe differences of AX on the meridian, and angles of po- 
sition with a 5-feet telescope of Troughton), they may be 
considered in an optical point of view equal to yours; viz. the 
5-feet telescope of Troughton to yours attached to the 5-feet 
equatorial; and ‘the 8-feet one of Dollond to yours attached 
to the 7-feet equatorial ; and after receiving the repeating mi- 
crometer of Fraunhofer, which I fixed to Troughton’s tele- 
scope, every desideratum in this instrument was fulfilled.” 
M. Struve, however, found himself involved in some prac- 
tical difficulties, until the arrival of Fraunhofer’s large re- 
fractor, an instrument which, with respect to double stars, 
left him nothing further to wish; and he determined on a new 
examination of all the double stars observed before (whether 
by Sir W. Herschel, Messrs. Herschel and South, or himself), 
as well as on a minute inquiry of the heavens from the north 
pole to —15° of declination, with respect to these objects. 
He has now accomplished one-third of the labour, and has 
found 1000 double stars of the first four classes ; among which 
800 are new, and of these nearly 300 are of the first class. He 
extends the examination to all stars of the 8th and (8°9) mag~ 
nitude. 
The author, after detailing a few more preliminary remarks, 
enters into a comparison of many of his observations with 
those of Sir W. Herschel, and of Messrs. Herschel and South, 
pointing out many cases in which their coincidence is truly 
remarkable ;—others in which there are discrepancies, evidently 
attributable to the relative or real motions of the stars in the 
intervals between the observations ;—others in which the di- 
versities seem occasioned by the instruments employed ;—and 
others in which there are anomalies which do not, as yet, admit 
of explanation. This part of M. Struve’s communication is 
not susceptible of abridgement. 
Report of the Committee appointed by the Council of the Astro- 
nomical Society, for the purpose of examining the Telescope 
constructed by Mr. Tur.ey, by Order of the Council. 
Your Committee in making this report, before entering on 
the immediate subject of it, think it will not be unsatisfactory 
to the Council if they recapitulate briefly the circumstances 
Vol. 67. No. 337. May 1826, 3B which 
