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IX. On the Tides. By John William Lubbock, Esq., V.P.R.S. 
Received March 15, — Read March 16, 1837. 
In my last paper on the Tides I endeavoured to point out the remarkable agree- 
ment which obtains in some respects between Bernoulli’s theory and results obtained 
from observations at the London Docks. Since that time my attention has been 
directed to the following points : 
1. To ascertain, from a discussion of the Liverpool observations with reference to 
a previous transit whether they present the same kind of agreement with theory as 
those of London. (See Tables I. to XII.) 
2. To ascertain whether, by taking into account a greater number of observations, 
the results given in my last paper remain sensibly unaltered. (See Tables XV. to 
XXVIII.) 
3. To ascertain whether the establishment of the port varies sensibly in different 
years, and wdiether the removal of the old Bridge has occasioned any difference at 
London. (See Tables XIV. and XXX.) 
Numerous tables have been computed for me, in order to elucidate these points, by 
Mr. Jones and Mr. Russell, having been enabled to procure their valuable assistance 
in these laborious investigations by means of a further sum of money placed at my 
disposal for the purpose by the British Association for the Advancement of Science, 
to which distinguished body I take this opportunity of offering my grateful acknow- 
ledgements. 
The succeeding transits of the moon being denoted by the letters A, B, C, D, E, F ; 
and F being the time of the moon’s transit which immediately precedes the time of 
high water at London, my last discussion of the London Dock observations was in- 
stituted with reference to transit B : the present discussion of the observations made 
at Liverpool between the 1st of January 1774 and the 31st of December 1792, by 
Mr. Hutchinson, has been instituted with reference to transit A-f-, or that which 
precedes the time of high water at Liverpool by about 2 d 0 h 20 m *9. This paper con- 
tains, in fact, two sets of tables precisely similar; the one set deduced from 13,391 
observations of high water made at Liverpool by Mr. Hutchinson, and the other set 
deduced from 24,592 observations of high water at the Wapping entrance of the 
* The former discussion by Mr. Dessiou, given in the Philosophical Transactions for 1835, was made with 
reference to the transit immediately preceding. 
t I had intended the transit B to be used as the argument : the mistake was not perceived until the work 
was too far advanced to make it worth while to have recommenced. 
MDCCCXXXVII. 
O 
