Measurement of three Degrees of the Meridian . 351 
or irregularities in the earth itself, are liable to affect the de- 
nominator of the fraction expressing the oblateness. 
Fortunately, it seems probable, that the utmost latitude of 
our present uncertainty is between the limits of 330 and 310, 
and the mean of these may be considered as a very near ap- 
proximation to the truth. 
Z z 2 
