ae 
i ae 
Nike 
i i 
Ba) 
mean by more than three times the mean of the errors, irrespective 
of sign; and when the number exceeds ten, the corresponding 
_ limit is two and a-half times the mean error. 
Of the twelve results thus rejected, the first at Barringun, 
and the pair ©.C. 604, 781, at Sand Hill, consist of 
stars of which none enter into any other combination ; r 
"proves that the latitude found from the pair M.C. 910 and ©.C. 798 
at each of the four stations, being much too great, the re 
arise only from the declination of one or both being too a 4 
and, as other combinations prove that the position of C.C. 7 ie 
correct, it follows that M.C. 910 is wrong. Agai the latitue’s 
as deduced from each of the three pairs of which B.ALC. 6,9828 
mfg being much below the mean at Stations 3 and 4, 
it is evident that the declination of that star is too low. 
"54; and Oy 
5” 1, 5”-39, and 1 43. 
altered ; and deducing from these the positions m —” wii 
seconds are—for a! Crucis, 40”-94 ; and for + Argis, 506; W 
© corresponding values as observed at Sydney this ee 
41-20 and 3”52, which differ from the Melbourne values PY 
0"-29 and 0”-20, 
1 : + the 
Imay add that, encouraged by the results obtainet eee 
stations connected with the trigom 
” : . ions : if 
survey of the Colony, using the mean of the puree probable ‘ 
from all available sources, and that in every case 
error has been thus diminished. 
those of 
