Astronomical Society. 295 



all these points with sufficient accuracy, the discoverer must, as soon 

 as he gets a second observation, send awo^Aer communication as above 

 directed, together with a statement of the longitude of the place^^^if 

 it should not be a known observatory : but the hope of getting a 

 second observation will not be admitted as an excuse for delaying 

 the communication of the first. 



" 6. The medal is to be adjudged twelve months after the disco- 

 very of the comet, and no claim can be admitted after that period 

 has elapsed. 



" 7. Professor Schumacher and Mr. F. Baily are to determine 

 whether a discovery is to be considered as established or not : but, 

 should they differ in opinion. Dr. Olbers, of Bremen, is to decide 

 between them. 



" N.B. Professor Schumacher and Mr. F. Baily have undertaken 

 to communicate to each other, respectively and immediately , such in- 

 formation as they may receive relative to the discovery of these co- 

 mets." — Dated November 1, 1835. 



XII. Observations of Moon-culminating Stars, made at the Ob- 

 servatories of Greenwich, Edinburgh, and Cambridge, during the 

 months of June, July, August, September, and October, 1835. 



December 11,1 835. — The following communications were read : — 



I. Sixth Catalogue of Double Stars observed at Slough, with the 

 20-feet reflector, in 1831 and 1832. By Sir J. F. W. Herschel, In 

 a letter to Mr. Baily. 



As this is, in reality, the eighth communication which appears in 

 the Memoirs relative to this subject, it has been considered desirable 

 that the following index should be given to the whole. The first 

 three are not numbered, but are headed differently from each other : 

 and a distinction must be drawn between the series ol' lists of measures 

 and the series of catalogues. 



Name in the Heading. 



Account, &c. 

 Approximate Places, &c. 

 Observations, &c.* 

 Fourth Series, &c.t 

 Micrometrical measures, &c. 

 Fifth Catalogue, &c.t 

 Second Series of measures, &c. 

 Sixth Catalogue, ikc.f 



These observations (the last of the preceding list) were made at 

 Slough, and would have been forwarded to the Society before the de- 

 parture of Sir J. Herschel for the Cape of Good Hope, had he not 

 been prevented, by pressure of other business at that time, from re- 



• Contains a comparison of Slough and Dorpat observations of 384 stars. 



f Only new stars numbered : others referred to other catalogues. 



X These nrc vwasures, not Stars. [Abstracts of these communications 

 will be found in Phil. Mag. and Annals, and Lond.& Edinb. Phil. Mag., for 

 the above years respectively. — Euit.] 



