Account of the discussions of Observations of the Tides which 
have been obtained hy means of the grant of money which 
was placed at the disposal of the Author for that purpose at 
the last Meeting of the Association. By J. W. Lussock, 
Esq., F.BR.S. 
Ar the last meeting of the Association held at Bristol I had the 
honour to communicate the results which I had then obtained ; 
I now wish to explain the manner in which the last grant of 
money which was placed at my disposal by the Association has 
been employed. 
1. I have engaged Mr. Jones to discuss 13,391 observations 
of the tides made in this place during nineteen years by Mr. 
Hutchinson, with reference to a previous transit, or that which 
precedes the time of high water by about 48 hours. These ob- 
servations are in the possession of the Lyceum at Liverpool, and 
they were granted with great kindness by the Committee of 
that Institution for the purpose of this inquiry. 
g. I have engaged Mr. Russell to extend the former discus- 
sion of the London Dock observations, by employing all the 
observations made from the 1st of September, 1801, to the 31st 
August, 1836, or 24,592 observations. Tables have been 
‘formed in precisely the same manner as those already sub- 
mitted to the Section at the meeting at Bristol. In some in- 
stances* irregularities have, in consequence of the additional 
number of observations, been eliminated, but altogether the 
agreement with the averages of nineteen years only (13,370 
observations) is much closer than I had anticipated. 
3. I have also engaged Mr. Russell to examine carefully the 
_ establishment and average height of high water, in order to 
ascertain the fluctuations to which these quantities are subject. 
Mr. Russell and Mr. Jones have spared no pains in order to 
" render the final results as accurate as the nature of the subject 
would permit, and I consider myself particularly fortunate in 
having been able to procure their assistance in these most la- 
_ borious calculations +. 
Even minute discrepancies between the results afforded By 
_ the Liverpool and London observations become interesting and 
* See the calendar month ‘inequality in the interval for January, the moon’s 
r parallax inequality in the height for parallax 56’, &c. 
+ The author placed before the Section the MS. books containing the de- 
tails of the work. 
