1841.] the Tides in the Indian Archipelago. 307 



to the East ; this latter, however, is almost annihilated by Easterly winds. 

 In the West monsoons, the stream runs to the East with little force, and 

 the water rises during the day ; the flood stream should accordingly 

 run in this season to the East ; but then at night scarcely any stream is 

 perceived, and the ebb tide which then runs, was observed to be anni- 

 hilated by the Westerly winds. 



East Monsoon. West Monsoon. 



< Wind E. 3> Wind W. 



Stream during Stream during 



During the day fallg. < the day or ebb. During day > the day flood 



Stream during Stream during 



Night rising < * the night or flood. Night falling > the night ebb. 



The mean duration of the rise and fall of the water is during the 

 whole year eleven and half to twelve and half, so that here ebb and flood 

 occur only once in the same day; nevertheless it appears that here 

 often little rises and falls, or those called short tides, have obtain- 

 ed alternately with them. It is worth noticing, that during a certain 

 period the flood tide always took place before noon, and during the 

 remainder of the year in the evening ; namely, in May, June, and July 

 the time of flood tide was daily in the morning about nine o'clock, 

 and one o'clock in the afternoon, without regular yet constant retarda- 

 tion ; this period from time to time suddenly shifting to an interval of six 

 hours. In the first half of August, this period occurred between half-past 

 seven and half-past eleven a.m. In the latter part of the same month, 

 between half-past five and eleven a. m. In September between one 

 o'clock and half-past ten a. m. In October between midnight and six 

 o'clock a. m. In the latter days of November between nine o'clock 

 a. m. and midnight. In February between three, half-past three, 

 and half-past eleven o'clock p. m. ; and so on, until in May this period 

 again occurred before noon. 



Thus it can be proved that in the E. monsoon, the flood tide 

 took place always before noon, and therefore the fall of the water 

 and also the ebb was during the day ; and in the West monsoon after 

 noon, so that the fall of the water and also the ebb were in the night, 

 while the opposite was observed with regard to high water and the 

 flood tide, as the mean interval from the period of the one flood tide 



2q 



