ASTRONOMY FOR 1889, 1890. 



129 



compared with ^ ludi. In fact, the position in space of the faint coiu- 

 l)arisou stars in relation to that of the star whose paralhxx is sought is, 

 if not a matter of accident, at all events wholly unknown until the ob- 

 servations and computations are complete." 



Professor Pritchard's results for stellar parallax, as published in the 

 third volume of the Oxford Observations, are as follows: 



The greater part of this volume is devoted to a discussion of the 

 parallax of 61 Cygni and the results seem to justify his remark that 

 'Mhe four comparison stars probably belong to a remote system not 

 containing GI Cygni." The probable errors deduced are small. 



At the annual visitation to the Oxford Observatory on June 12, 1890 

 Professor Pritchard announced the results of the determination of 

 parallaxes of six more stars by the photogra])hi(; method, as follows; 



£ Cygni 



rt^'yg'ii 



(5 Andromertai . 



a Arietis 



a Persei 



fj Ursie Miuoris 



Prob. 

 error. 



0. 034 



. 029 

 .023 

 .027 

 .029 

 .030 



The subjoined table forms a summary of a ])aper published in the 

 Astronomische Nachrichten, ISTos. 2915 and 2910, by Dr. Omlemans, in 

 which he collects the scattered results for stellar paraHax obtained in 

 the past sixty years. Dr. Oudemans concludes that " stars ivith proi)er 

 motions greater than O."05 have probably an annual parallax of {>."10 

 to 0."50. 



H. Mis. 129 9 



