467 



remarkable difference also obtains in the London semi-menstrual cor- 

 rection for the height. 



The calendar month inequality at Liverpool, considered as result- 

 ing implicitly from the corrections due to changes in the declinations 

 of the luminaries, and in the sun's parallax, agrees generally with Ber- 

 nouilli's theory, and with the results deduced from the London obser- 

 vations given in the author's last paper. 



The author finds that the Establishment of the Port of London has 

 been subject to changes even since the beginning of the present cen- 

 tury, and he notices the difficulty of predicting the time of high water 

 with accuracy unless these changes can be accounted for. He also 

 cites a very ancient Tide Table, from which it would appear that for- 

 merly the time of high water at London was an hour later than it is 

 at present. 



The Society then adjourned over the Easter recess, to meet again 

 on the 6th of April next. 



