DESIDERATA^ ETC. 
XVII 
4. The Reduction of Bradley’s and Maskelyne’s Observations 
of the Sun and Planets, on a uniform plan. 
5. Remeasurement* of the elongation of Jupiter’s Satellites; 
to correct the estimate of the mass of Jupiter. 
6. Separate investigations; from observations, of the diminu¬ 
tion of the aphelion distance and perihelion distance of Encke’s 
Comet, for the purpose of testing the truth of Encke’s assumed 
law of density of the resisting medium. 
7- Calculations of the perturbations of Biela’s Comet for the 
interval between 1772 and 1806, and of those of the node and 
inclination from 1806 to 1826, for the purpose of ascertaining 
the identity of the comet of 1772 , and examining whether this 
comet gives any indication of a resisting medium. 
8. Verification of Burckhardt’s Formulae in th eMem. de V Inst. 
for 1808, and extension of them to terms depending on the in¬ 
clination. 
9. Theory of the perturbations of Pallas, and of Encke’s Comet. 
TIDES. 
Resolutions of the Committee . 
1. That a sum not exceeding 250/. be placed at the disposal 
of Mr. Lubbock for the discussion of observations of the Tides. 
2. That the Association should endeavour to procure the 
general establishment of systematic Tide Observations along 
the coasts of Great Britain and Ireland, and that the standing 
Committee on Tides be requested to select such places f as may 
appear to them most important for this purpose; that the di¬ 
rection, and if possible the intensity, of the wind should be ob¬ 
served, as well as its critical changes after having set for some 
time in a particular direction; and that the altitude of the cur¬ 
rents of air should also be, as far as possible, remarked. 
METEOROLOGY. 
Resolutions of the Committee . 
1. That a series of observations of the Thermometer during 
every hour of the day and night, be instituted at some military 
or naval station in the South of England. 
* Prof. Airy himself has since given a determination of the mass of Jupiter. 
f Directions for observing the Tides, extracted from Mr. Lubbock’s Report, 
and Mr. Whewell’s Memoranda, are inserted p. xxxiii. 
b 
