OF THE TIDES IN THE PORT OF LONDON. 45 



must thus ascertain whether the empirical forms of the corrections for parallax and 

 declination, deduced from these, agree with those obtained for London in the pre- 

 ceding pages. If they do, the coefficients must be compared with each other and 

 with the theory, in order to determine the most promising mode of pursuing the 

 latter. 



The empirical formulae obtained in the preceding pages represent the observations 

 with tolerable exactness ; probably they agree with them almost as well as any for- 

 mulae would do, and as well as the observations agree with each other. These for- 

 mulae might be used in calculating tide tables as readily as any other empirical rules; 

 and the tables so calculated might be compared with observations made at London. 

 Such a comparison, continued long enough, would disclose any additional corrections 

 which may be requisite in this mode of calculating tide tables. 



Tide observations are now made at the Katharine Docks, with good apparatus and 

 a judicious system ; and, so far as I can judge, with proper care. These will here- 

 after form materials for a better discussion of the London tides than the London Dock 

 observations, made in a ruder manner, could allow. 



