1841.] the Tides in the Indian Archipelago. 309 



The highest water-mark was likewise observed about this period. 



At Fagol, on the north coast of Java. 



It appears that here also, as at Klampsis, no streams of ebb and 

 flood, strictly speaking, are to be found, the tides generally being very 

 irregular, and the streams, which seem to be dependent on the wind, at 

 most amounting to a quarter or half a mile. 



The duration of the rise and fall has a singular course. In January 

 it is sometimes six hours, so that there accordingly flood and ebb tides 

 occur generally twice in a day ; and only one rise and fall of much 

 longer duration than ordinarily is perceived at new and full moon. 

 In the succeeding months, these longer tides repeatedly occur after 

 new and full moon, so that at this period, for several succeeding 

 days, the flood tide comes in but once a day, and thus also the ebb, 

 and the duration of the rise and fall of the water is respectively twelve 

 hours. In May, about new and full moon, they continue for eight days, 

 and likewise the whole month of June the duration of the ebb and 

 flood tide is respectively twelve hours ; so that there is but one flood and 

 ebb tide during the day. 



Then again in July, at new and full moon, there are tides of about 

 six hours' duration, so that two tides again occur in a day. 



In August and September, the number of days when short tides 

 are perceived, is increasing. In October, the duration of all tides is 

 about six hours, and in November and December, at new and full 

 moon, they again come in some long rises and falls. 



At the period of the change from these common or short tides (of 

 about six hours) to the long ones (of about twelve,) a great rise and fall 

 generally is alternate with a small one, and it is a remarkable fact, 

 that these smaller rises and falls gradually decrease until they entirely 

 disappear, and only one rise and fall takes place in the twenty-four hours. 



The reverse was the case on the change from long tides to the 

 common or shorter ones. 



The same also appears to happen as regards the time of rise and 

 fall, though in a less striking degree. 



The time of flood and ebb tide is here likewise very uncertain. It may, 

 however, be stated, that at new and full moon, the ebb tide comes in 

 about three o'clock in the morning, while it is more regular with regard to 



