made at the Cajje of Good Hope, 



451 



" On the 28th of June I discovered an annular nebula in R.A* 

 17" 10'" 36% N.P.D. 128° 18' (all the above places are for January, 

 1830). It is exactly round, and perfectly well-defined, diameter 15", 

 very faint, like that in Cygnus, and situated among an immense crowd 

 of stars. 



" On the 2nd of July I was fortunate enough to light on another 

 very delicate and beautiful planetary nebula in II. A. If)'' 5"" 15', 

 N.P.D. 135° r (1830-0), having a diameter of I«-35 in time, and 

 a perfectly sharp disc, equal to a star of the 8*9 mag. in light. (My 

 assistant, J. Stone, to whom I showed it, said it was like the moon, 

 round and clean, only smaller.) 



** Among the more delicate and close double stars I have observed, 

 either with the 20-feet, or the 7-feet equatorial (which I have suc- 

 ceeded in mounting very satisfactorily under a revolving roof of a pe- 

 culiar and very simple construction, which answers completely,) which 

 I employ on moonlight nights for measuring double stars, and for the 

 purpose of a review of all the stars in the Brisbane Catalogue (of 

 which I procured from Mr. Richardson an index copy in MS.), I may 

 mention the following : 



I Apparatus 

 ^ Phoenicis 

 X Eridani ... 

 ^ Reticuli ... 



T Argus 



/3 Hydrae ... 

 y Lupi 



•y Coronae Aust. .. 



Anonym , 



22 Piscis Aust. 



A most delicate object. 



FJxcecdingly close. 

 i *Ithink this has been 

 ( observed before. 



To which I may add also \ Octantis, &c. &c. 

 " With much difficulty, and after almost despairing of arriving at 

 anysatisfactory measures, I succeeded in procuring pretty trustworthy 

 angles for y Firginis, about the predicted perihelion. The stars then 

 were materially better defined than in May, June, or July. They, 

 agree, within reasonable limits, with the calculated angle. 



" a CruciSy if Dunlop's measures are correct, is in a state of pretty 

 rapid rotation, having described 7° since 1826. To the list of binary, 

 stars I am at length enabled, unhesitatingly, to add ^ Libra, as the 

 following series of angles will abundantly prove : — 



1782-36 Pos. = 7° 58' .... H.Catal. 



1825-49 .... 171 54 .... South. 



1830-28 181 30 H., junior, Slough. 



1834-35 189 3 Ditto, Feldhausen. 



This last measure was obtained under circumstances much more satisfactory 

 than it is ever possible to obtain in Europe, from the low situation of 

 the star. 



Neither can we doubt that 36 Ophiuchi is binary. Mayer makes 



3 M 2 



