168 
THE REV. W. WHEWELL’S RESEARCHES ON THE TIDES. 
3. Port de la Coquille , Isle of Ualan, Caroline Archipelago, latitude 5° 21 ' N., lon- 
gitude 163° 5' east of Greenwich. Observations made in December 1827- 
These observations were made for about nineteen days, with interruptions. They 
exhibit some of the same features as the two preceding places ; a very large diurnal in- 
equality, both of the heights and times, and both at high and low water. In this case 
the inequality of the heights appears to be greatest for high water. Also its maximum 
appears to alternate with the maximum of the inequality for low water ; but the series 
of observations is too short and incomplete to determine this point with certainty. 
Having allowed for the diurnal inequality, we obtain a very large semimenstrual 
inequality. The luni tidal intervals appear to oscillate from 3 h 30 rn to 6 k 16 m . These 
very wide changes may throw suspicion upon the exactness of the observations ; yet 
the changes are so regular and continuous, as greatly to remove such suspicions. 
According to these results the mean lunitidal interval or corrected establishment is 
4 b 53 ni . 
4. Port Lloyd , Isle Bonine-Slma, latitude 2 /° 5' N., longitude 142° 5' west of Green- 
wich. Observations made May 1828. 
Port Lloyd has a very large diurnal inequality, affecting both the times and the 
heights ; it affects most the high- water times and the low-water heights. In the in- 
equality of the heights, the maxima for high water and low water appear to alternate; 
in the times, this is more obscure; but we cannot expect clear evidence on this head, 
the observations including only nine days. 
For the same reason it is impossible to state with any precision the establishment 
of this place. The maximum lunitidal interval (cleared of diurnal inequality) is 
gh 40 m . anc | f rom the course of the curve which represents the observations, it ap- 
pears certain that the semimenstrual inequality of times is large. If this inequality 
be two hours, the mean lunitidal interval will be 7 h 42 m . 
The observations sent by Admiral Lutke contained an account of the Establishment 
of several other places in the North Pacific ; but, as I have already stated, the term 
establishment becomes in the highest degree vague, and almost unmeaning, when 
applied to seas in which the phenomena of the tides are such as are described in the 
present paper. 
P.S. From the account of Admiral Freycinet’s voyage, it appears that at several 
places in the North Pacific, the tides, as observed in that expedition, exhibit features 
similar to those here noticed. 
