The second column of the table of latitudes must now be considered the true one, as that which really resulted from the observations.

Now, on examining the column of true latitudes, the differences between the different sets of observations is so considerable as naturally to excite some fear of latent error, more especially as nearly the greatest discordance arises from the same star, Alph.Lyrae, observed after an interval of only three days.

It becomes interesting to every person engaged in making astronomical observations, to know what is the probability of his being exposed to an error so little to be guarded against, and so calculated to lull the suspicions of the unfortunate astronomer to whom it may happen.
In fact, the question resolves itself into this: the true latitude of a place being determined by sets of observations as in the first of the following columns-- Latitudes as True latitudes observed.

computed by a mistake of Capt.

Sabine's.
deg.min.sec.