Deo. fr 1850 850. It will now be seen from the table of co 
while the star was telescopic were made by means of x 
“comparisons 
the 4}-inch equatorial armed with a comet eye-piece, the field of 
_ which was sufficiently great to include the variable and the com- 
parison-stars at one view. Some few com parisons were made by 
meansof a34-inch refractor. At the close of the paper will befound 
two tables, one containing a list of the telescopic comparison stats, 
_ and theotherthe concluded magnitudes of th variable, for the whole 
period embraced by this paper. The co-ordinates of the compari- 
son-stars are given with reference to the variable itself, and were 
determined from observations with the filar-micrometer of the 44- 
inch mE RES Some of the stars were excessively faint under 
arti illumination, but their positions are sufficiently accurate 
for the purposes of ready identification. The comparisons of the 
variable were made with the utmost care. From May 11th tothe 
close of November the telescopic Mangas AMCS were employed, 
Owing to the brightness of the moon on November 14th and 17th 
the variable could not be seen sie the —. eye, but not- 
withstanding her presence on the 20th it could be readily seen 
without optical aid. From this time the is Ae were made 
by unassisted vision with a selection of stars from the Uranometria. 
_ So early as December 19th suspicions were entertained that the 
% shing on a 
- mated to be secihaily — to No. 119 Carine of the Uranometria, 
which is synonymous with No. 3753 of Lacaille’s catalogue. At 
_ the close of January Eni examined the smallest com 
n = 
the method of limiting apertures, and found that those marked 2 2, 
4, 6, and 7 could just he seen with the 43-inch telescope wi 
__ aperture diminished to one inch, so I adopted their magnitudes as 
a: 4 ‘sun the magnitude of 12, or Lacaille 3993, which was the 
brightest i -apie the field of the comet eye-piece Laker’ mentioned, was 
the Uranometria to be of the 6°9 magnitude. 
ae Adopting these stars as the limits of the scale I carefully estima 
So engstake magnitudes of the other stars: the resulting magn 
_ tudes are contained in the second silanes of the table. ~~ 
curacy of these estimates was confirmed on March 30th by 3 
careful examination with the same telescope of a selection * Sud. 
from Oeltzen’s Argelander’s Zonen-Beobachtungen 15° to 31° Sua. 
= 
