MR. LUBBOCK ON THE TIDES. 



165 



Table XLVIII. 



Showing the Correction for the Moon's Declination in the Height of High Water, 

 formed by arbitrary alterations from Table XLI. 



The last Tables, intended to serve for the prediction of the tides in the port of 

 London, seem to me fairly to embody the results furnished by more than 10,000 ob- 

 servations. They might perhaps be amended in a subsequent revision, by applying 

 these corrections, considered as approximate, to each of the observations employed, 

 with a contrary sign, so as to obtain a discussion of their errors. I am confident, 

 however, that they are not susceptible of any material improvement ; and that we 

 may proceed safely to investigate the laws or expressions which they represent. It 

 will also be desirable to ascertain, by a discussion of their errors, when used in pre- 

 dicting the phenomena, whether the fluctuations of the atmosphere, as indicated by 

 the barometer, have any sensible effect, as is the case, according to M. Daussy, on 

 the coast of France, and also to discover the extent to which the phenomena are mo- 

 dified by winds and storms. 



The Tables might be rendered more convenient for practice by the addition of a 

 constant, so as to render all the corrections positive, but I have retained them in their 

 present state in order that the law of the inequalities may be more apparent. This 

 change can easily be made if required, but by such a process the intrinsic character 

 of the Tables is not altered. 



In the Philosophical Transactions for 1833 I gave the semimenstrual inequality, 

 including of course the establishment for Brest, Plymouth, Portsmouth, and Sheer- 

 ness. M. Dessiou has since deduced the following Tables for Pembroke Dockyard, 

 Liverpool, Howth, and Ramsgate. 



