304 Succinct Review of the Observations of [No. 112. 



The mean rise and fall was about ebb, 78 



The greatest ditto ditto, ... ... ... 1 49 



The smallest ditto ditto, ... ... ... 6 



The difference in the elevation of the succeeding tides is remarkable, 

 viz. a greater rise and a smaller one were perceived to take place 

 alternately, and in the same manner also the ebb tides.* This alter- 

 nation of flow and ebb which is very regular may hereafter be shown to 

 be in connection with the moon's decrease, though perhaps more so at 

 this place than at the other stations of the Archipelago. 



The greatest difference between high and low water, as well as 

 the highest rise, occurred in October and November, and generally 

 in the months when the West monsoon prevails. 



At Filitjap, South coast of Java. 



On the south coast of Java the tides were most regular in all respects, 

 consequently the observations made upon them are best adapted to 

 furnish a general rule. 



The course of the flood tide was to the West into the outlet, and 

 followed the direction of its shore. The ebb tide ran in an oppo- 

 site course. In the westerly passage or creek of Segara Anakon, 

 the tides had a course quite the reverse; here the streams met 

 consequently the rise and fall took place without stream. In gene- 

 ral the stream appears to run, at least in the East monsoon, along 

 the coast to the East, at the rate of half a mile in four hours. In 

 the straits of Filitjap in the West monsoon, the ebb and flood tides 

 ran at the rate of two and three miles, and in the East monsoon at 

 five and five and a half miles. The tides evidently follow here, as well 

 as at Pulo Chinco, the common rule. The mean duration of rise and 

 fall was about six hours and a half, and this took place with much re- 

 gularity, two tides in one day ; but also smaller rises and falls between 

 the usual ones have been sometimes noticed, amounting to 0-20 ebb. 

 The duration of still water is here very regular for ten or fifteen minutes 

 after high and low water. The ebbs and floods are about equal in 

 force and duration. At new and full moon the mean time of the flood 

 tide was between eight and nine hours, viz. 



*Note. — A nautical friend has pointed out that night tides are generally 

 the highest, thus giving an alternation. |I| 



