54 
December 8 th. 
Robert Worthington, F.R.A.S., Vice-President of the 
Section, in the Chair. 
Mr. Baxendell read a “ Note on the Period and Changes 
of the Greenwich Variable in Vulpecula, No. 1773 of the 
Twelve-Year Catalogue.” 
In No. 1500 of the Astronomisclie Nachrichten , Dr. Schon- 
feld, Director of the Observatory at Mannheim, expresses a 
doubt as to the variability of several of the stars in Mr. Cham- 
bers’s Catalogue of Variable Stars. One of the objects which 
he thus points out as doubtful is Np. 1773 of the Greenwich 
Twelve-Year Catalogue, which was entered in Mr. Chambers’s 
list on my authority, as I had satisfied myself from occasional 
observations made since 1861, that its light was subject to 
periodical changes, though not to the extent indicated by the 
observations of Messrs. Rogerson and Glaisher, made in 1837. 
I have since reduced my observations, and have obtained 
from them the following times of maximum and minimum 
brightness : — 
Maxima. 
1862, Oct. 20. 
1863, Sep. 12. 
„ Nov 19. 
1864, June 15. 
„ Aug. 21. 
„ Nov. 8. 
Minima. 
1862, Nov. 24. 
1863, Oct. 25. 
„ Dec. 25. 
1864, May 13. 
„ July 21. 
„ Oct. 7. 
Treating the equations formed from these data by the 
method of least squares, we have, from the observed maxima, 
Period=67’97 days. 
Epoch=1864, Feb. 1*37. 
And from the observed minima, — 
Period =67 ‘88 days. 
Epochs 1864, January l*59 s 
