ASTRONOMY P^OK 1889, 1890. 



129 



compared with s ludi. In fa(;t, the position in space of the faint coiu- 

 ])aii.sou stars in rehition to that of the star whose parallax is sought is, 

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

 servations and comi)utations are com[>lete.'" 



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

 third volume of the Oxford Observations, are as follows: 



The greater })art of this volume is devoted to a discussion of the 

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

 "'the 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 announcjed the results of the determination of 

 parallaxes of six more stars by the photograi)hi(' method, as follows: 



The subjoined table forms a summary of a paper published in the 

 Astronomische Nachrichten, Nos. L'915 and 291(>, by Dr. Oudemans, in 

 which he collects the scattered results lor stellar parallax obtained in 

 tiie past sixty years. Dr. Oudemans concludes that " stars vvith ])r()per 

 motions greater than ()."()5 have probably au annual parallax of 0."10 

 to 0."50. 



11. Mis. 129 9 



