TRANSACTIONS OF THE SECTIONS. 7 
Bett Been taking, singly, any of the fifteen intervals which occurred at 
Dundee, and laying them down .as ordinates, the line joining their 
_ extremities was not found to form a perfectly regular curve. The 
_ tides being influenced by the particular direction and velocity of the 
- wind, are sometimes retarded and sometimes accelerated, so that or- 
% dinates representing the intervals must occasionally be longer and 
_ shorter than they would be in the absence of such a source of dis- 
3g turbance. The author, however, found, to his great satisfaction, that 
i upon taking the averages of all the intervals corresponding to the 
_ same ‘parallaxes and declinations, a perfectly regular curve resulted, 
_ very similar in form to that for London, only running much higher. 
_ This semi-menstrual curve for Dundee is represented by the fainter 
line crossing the diagram. In the following table, the fifteen intervals 
_ for London occupy the second column, and those for Dundee the third 
~ column. 
Tide after Tide after 
Moon’s Age. | Moon’s Transit | Moon’s Transit | Difference. 
at London. at Dundee. 
Days. h m h m h m 
1 y ean ay g 42 O 45 
2g 1 45 2 26 O 41 
3 1 32 2 6 O 34 
4 1 19 1 50 O 31 
5 I 6 1 45 O 39 
6 O 54 1 35 O 41 
7 0 46 1 35 O 49 
8 O 43 1 40 O 57 
9 0 45 1 49 1 4: 
10 ] 1 2 15 1 14 
11 LEAT 2 40 Ts es 
12 1 57 Z 52 O 55 
13 He 8 2 55 O 47 
14 2 10 QQ 49 O 39 
15 Q 4 2 40 O 36 
From the fourth column of this table it appears that the intervals of 
time between the meridian passage of the moon and the time of high 
water at Dundee exceed the corresponding intervals at London, from 
31 minutes to 1 hour 14 minutes. The “corrected establishment ” 
_ for any place, according to Mr. Whewell, is the mean of the intervals 
_ which occur between the meridian passage and the times of high 
_ water. At Dundee, therefore, the corrected establishment is 2 hours 
15 minutes, which, it is rather singular, happens exactly to agree with 
_ the time given in the Nautical Almanac for high water at full and 
_ change. As to the existence of a diurnal inequality, either in the 
_ time or height of the tides at Dundee, he did not consider the obser- 
