Briinnow — On the Farallax of the Planetary Nebula. 129 



Taking, then, for ASq the value 62''-900, and computing the values 

 of the coefficients of dA', k, and tt for every observation, I obtained 

 the following system of equations of condition : — 



Date. 



Equations. 



Residual 

 Errors. 



1871. 













Aug. 



13, 



^. A80- 0-382 (?A'- 0-778 



< -0-637 77 



= -0"-367 



- 0"-260 



?j 



15, 



-0-376 



-0-798 



-0-609 



-0 -376 



- -268 



>> 



25, 



-0-349 



-0-888 



-0-465 



+ -255 



+ -366 



j> 



27, 



-0-343 



-0-903 



-0-434 



-0 -086 



+ -026 



Sept. 



II5 



-0-303 



-0-982 



-0-191 



+ -028 



+ -138 



J) 



12, 



-0-300 



- 0-985 



-0-175 



-0 -137 



- -029 



j> 



13, 



-0-297 



-0-988 



-0-158 



-0 -111 



- -003 



)) 



21, 



-0-275 



-1-000 



-0-022 



-0 -091 



+ -013 



}} 



23, 



-0-270 



-1-000 



+ 0-013 



-0 -300 



-0 -198 



j> 



28, 



-0-256 



-0-995 



+ 0-099 



-0 -121 



- -024 



Oct. 



7, 



-0-231 



-0-968 



+ 0-250 



+ -018 



+ -106 



)} 



20, 



-0-196 



-0-888 



+ 0-458 



+ -008! + -076 



j> 



2I5 



-0-193 



-0-879 



+ 0-473 



+ -108' + -175 



77 



24, 



-0-185 



-0-854 



+ 0-517 



+ -018 +0 -079 



Nov. 



5, 



-0-152 



- 0-727 



+ 0-681 



+ -049 +0 -089 



77 



22, 



-0-106 



-0-495 



+ 0-858 



- -042 - -039 



Dec. 



16, 



-0-040 



-0-092 



+ 0-980 



+ -045 - -006 



7) 



19, 



-0-032 



-0-039 



+ 0-983 



+ -073 1 + -014 



J> 



20, 



-0-029 



-0-021 



+ 0-983 



+ -145 



- -206 



1872. 













Jan. 



6, 



+ 0-017 



+ 0-278 



+ 0-945 



-0 -089 



-0 -185 



March 



I5 



+ 0-069 



+ 0-952 



+ 0-304 



+ -357 



+ -190 



7> 



8, 



+ 0-188 



+ 0-982 



+ 0-188 



+ -196 



+ -026 



,, 



14, 



+ 0-204 



+ 0-996 



+ 0-086 



+ -249 



+ -079 



77 



17, 



+ 0-212 



+ 0-999 



+ 0-034 



+ -198 +0 -029 1 



April, 



85 



+ 0-259 



+ 0-966 



-0-257 



+ -140 



- -021 



V 



12, 



+ 0-284 



+ 0-975 



-0-404 



+ -179 



+ -025 



55 



13, 



+ 0-286 



+ 0-908 



- 0-420 



+ -112 



- -040 



May 



31, 



+ 0-417 



+ 0-325 



-0-960 



+ -092 



+ -008 



June 



5, 



+ 0-431 



+ 0-244 



-0-984 



+ -031 



- -044 



5) 



7, 



+ 0-437 



+ 0-213 



- 0-992 



+ -054 



- -019 



July 



14, 



+ 0-538 



+ 0-393 



-0-935 



-0 -099 



-0 -116 



Aug. 



2, 



-0-590 



- 0-659 



-0-763 



-0 -001 



+ -002 



55 



65 



-0-601 



-0-708 



-0-716 



-0 -005 



+ -001 



In solving these equations according to the method of least squares, 

 the -weight of all observations, with the exception of that of March 1, 

 1872, which is incomplete, has been taken equal to 1. I obtained 



