Prof. Hansteen on the Magnetic Poles of the Earth. 167 
ability the Mécanique Céleste, will not allow this part of his sub- 
ject to pass without receiving decided improvement at his hands. 
Indeed the problem of the determination of the figure of the 
earth has now arrived at that point, (as Captain Sabine has re- 
marked to me,) that no results from experiments on the pen- 
dulum should be admitted which are not of the accurate de- 
scription ; and I may add, that the requisite formule em- 
ployed in making the usual deductions should also possess all 
the accuracy that the present state of science can give them. 
I am, sir, yours, &c. 
Edinburgh, Feb. 9, 1826. Witiiam GaLBRAITH. 
XXV. On the Number and Situation of the Magnetic Poles of 
the Earth. By Professor CuristopHER HansTEEn. 
[Concluded from p. 124.] 
I. Observations of Declinations by Captain Sabine, in the 
voyage of Captain Ross in the year 1818. Extracted from 
‘the Philos. Trans. for the year 1819. 
Long. W. from} Declination. 
Greenwich. West. 
° 
53 
* Observations on Hare Island, + On the 3 Baffin’s Islands, 
Lah 
