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VI. Additional Note to the Eleventh Series of Researches on the Tides. By the Rev. 
W. Whewell, B.D. F.R.S., Fellow of Trinity College, Cambridge. 
Received February 7, — Read April 2, 1840. 
The tide observations which I recorded and discussed in my eleventh memoir on 
that subject, were laid before the Royal Society, because, though the different series 
of observations were both brief and imperfect, the features of the tide phenomena as 
there exhibited were novel ; and it appeared desirable to put them on record with a 
view to future comparison with other places. I have now to notice other observations 
which I have received from another region, and which display similar features in a 
still more remarkable manner. These, with the results of a few other sets of obser- 
vations, which may, I trust, hereafter be of use, I beg to lay before the Society, as an 
Appendix to my eleventh memoir on the subject of the Tides. 
The principal tide observations which I now bring forward are those for which I 
am indebted to the Russian Admiral Lutke. These observations were made in 1827 
and 1828 by the officers and men of the Seniavine corvette, commanded by the (then) 
Captain Lutke. From the account given me of the mode of observing, it appears 
that they were made with proper apparatus and with great care and perseverance, as 
is indeed sufficiently shown by the observations themselves. At one place (Petro- 
paulofsk in Kamtchatka) the height of the surface was carefully observed every ten 
minutes day and night ; and when near its maximum, every two minutes. And it is 
proper to remark, that this great care and labour, which would have been superfluous 
at most places, was necessary in this instance. If the observations had not been thus 
continued, they would not have enabled us to detect the very curious laws of the phe- 
nomena which I have now to describe. 
I shall first state the peculiar features of the tide phenomena shown by these ob- 
servations ; and I shall afterwards add such portions of the registers and calculations 
as seem requisite to confirm and illustrate what I shall state. 
1. Petropaulofsh, in the Bay of Avatcha, peninsula of Kamtchatka, latitude 53°T N., 
longitude 158° 44' E. Observations made in October 1827, June 1838, October and 
November 1828. 
On laying down these observations, in our usual manner, in curve lines, it appeared 
(as at Bassadore, already noticed in this memoir,) that the high water is affected in 
its time by a very large diurnal inequality, while the height is only slightly affected 
by an inequality of that kind. This diurnal inequality of the time reaches the enor- 
mous amount of above four hours ; thus the intervals (between moon’s transit and 
MDCCCXL. Y 
