FAVOURABLE TO THE INVESTIGATION OF PARALLAX. 
345 
Table I. (Continued.) 
Year, Month 
and Day. 
Fraction 
of year. 
Position. 
Pi'obable 
error. 
Computed 
weight. 
Assigned 
weight. 
Distance. 
Assigned 
weight. 
Magnitudes. 
Colours. 
Observer. 
P XXII 306 
1843. June 25 . 
•479 
143 2 
6 
8-467 
6 
6-7—9 
White. 
G. 
July 3. 
•501 
143 56 
6 
8-353 
6 
6-7—9 
White. 
G. 
6. 
•509 
144 17 
5-5 
8-461 
5-5 
6-7—9 
White. 
G. 
Dec. 17- 
•958 
145 46 

4-1 
8-521 
3-5 
6-7— 8-9 
White. 
S. 
1844. Jan. 11. 
•027 
145 34 
4-5 
8-618 
4-2 
6-7—9 
Reddish and white. 
S. 
13. 
•033 
144 13 
4-9 
8-788 
4-7 
6-7—9 
White. 
s. 
Nov.* 27 . 
•906 
146 0 
6-4 
8-670 
6-5 
7—9 
Blue. 
p. 
1846. Dec. 14. 
•950 
146 18 
1-1 
8-350 
1-3 
8—10 
Pale yellow and pale blue. 
p. 
22. 
•972 
146 3 
4-1 
8-335 
3-8 
7-8-9 
Yellow and pale blue. 
p. 
1847. Dec. 28. 
•988 
146 16 
1-7 
8-024 
1-7 
7-8—9 
Whitish and pale blue. 
p. 
1848. Dec. 21. 
•972 
145 37 
4-6 
8-251 
4-7 
7.8—9-10 
Yellow and pale blue. 
p. 
The Second Table. — This table contains the means of all the results obtained at 
the same period of each year, when observations have been obtained on two or more 
days. 
The second column contains the mean epoch of the results from which the means 
are formed. 
The positions in the third column are computed in the ordinary mode by multiply- 
ing each individual set by its computed weight as contained in the fifth column of 
Table I., adding the products, and dividing by the sum of all the weights. 
The fifth column contains the sum of the computed weights of the individual sets, 
from which the probable error of the mean in the preceding column is calculated 
from the equation 
P=-i= 
\/W 
The computed weights inserted in the Tables have been multiplied by 1000. 
The mean distances in the seventh column are computed in the same manner, 
using, however, the arbitrary or assigned weights in column 8 of Table I., instead 
of weights computed as above explained ; for it was not deemed necessary, for 
reasons which will appear in the sequel, to apply the calculus of probabilities to the 
reduction of any of the observations of the distances. 
The quantities in the sixth and eighth columns, headed “ Assigned weight,” are the 
sums of the weights assigned to the individual sets, from which each mean is formed. 
* A power of 190 used. 
