adley's method, without endangering its elegant
simplicity and effectiveness by attempts at improvement, other than
supplying certain means of instrumental control which would without
doubt commend themselves to his sagacious mind.

[Sidenote: Other puzzles explained.]

"In the next article Bradley's later observations at Greenwich, the
results of which are not so distinct, will be discussed; and also
those of Brinkley at Dublin, 1808-13 and 1818-22. This will bring
again to the surface one of the most interesting episodes in
astronomical history, the spirited and almost acrimonious dispute
between Brinkley and Pond with regard to stellar parallaxes. I hope
to show that the hitherto unsolved enigma of Brinkley's singular
results finds its easy solution in the fact of the polar motion. The
period of his epoch appears to have been about a year, and its range
more than a second. Afterwards will follow various discussions
already more or less advanced towards completion. These include
Bessel's observations at Koenigsberg, 1820-24, with the Reichenbach
circle, and in 1842-44 with the Repsold circle; the latitudes derived
from the polar-point determinations of Struve and Maedler with the
Dorpat circle, 1822-38; Struve's observations for the determination
of the aberration; Peters' observations of _Polaris_, 1841-43, with
the vertical-circle; the results obtained from the reflex zenith-tube
at Greenwich, 1837-75, whose singular anomalies can be referred in
large part to our present phenomenon, complicated with instrumental
error, to which until now they have been exclusively attributed; the
Greenwich transit-circle results, 1851-65, in which case, however, a
similar complication and the large accidental errors of observation
seem to frustrate efforts to get any pertinent results; the Berlin
prime-vertical observations of Weyer and Bruennow, 1845-46, in which I
hope to show that the parallax of [beta] _Draconis_ derived from them
is simply a record of the change of latitude; the conflicting
latitude determinations at Cambridge, England; the Washington
observation of _Polaris_ and other close Polars, 1866-87, with the
transit-circle; also those at Melbourne, 1863-84, a portion of which
have already been drawn upon in the last number of the _Journal_,
and so