308 Succinct Review of the Observations of fNo. 112. 



to that of the next was about twelve or thirteen. The succeeding tides, 

 or the duration of that of the rise and fall generally decreased in an 

 inverted arithmetical progression from between nine to fifteen hours ; 

 the difference between the rise and the succeeding fall of the water was 

 most remarkable at new and full moon. There has been a single in- 

 stance, in which the duration of the fall did not exceed an hour, while 

 again a rising of three-quarters of an hour has been observed. 



The sum of the two succeeding tides, or the duration of the rise of 

 the water and the succeeding fall, always amounted to somewhat 

 more than twenty-four hours. 



This was not the case as regards the height of the tide and of the 

 succeeding fall, which was almost constantly equal. 



Here also, as elsewhere, it is notable, that a great rise and fall occurs 

 alternately with a small one, and the difference in the rise and fall 

 decreases till no longer perceptible, when it again increases, which 

 phenomenon must (at least at the first glance) be accounted for as 

 the effect of a powerful cause; as for instance, the decrease of the 

 moon as has been already done. 



The common rules are here also not sufficient to calculate the time 

 of high water. It also deserves notice, that at new and full moon the 

 flood tide generally, excepting some instances in October and April, 

 came in between eight and ten o'clock, viz. the morning, when the afore- 

 said periods in which, according to the season of the year, the flood 

 tide must take place, corresponded with the morning, that is in the 

 East monsoon, and in the evening, when the converse took place, that 

 is in the West monsoon. 



The flood of eight or ten o'clock, whether in the morning or in the 

 evening, took place in almost all periods, as above mentioned. 



The period of the flood tide at new and full moon cannot, however, 

 be averaged or used to calculate the mean time of high water for 

 another day. 



The mean rise and fall of the water was,... 1* 12 ebb. 



The greatest, ... ... ... ... 2* 13 



The smallest, 0-11 



The greatest difference between high and low water occurred in Ma}', 

 June, and December, after new and full moon, though this by no means 

 was always the case. 



