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



The greatest difference between high and low water took place in 

 the West monsoon, and then especially at new and full moon, in the 

 other parts of the year. The position of the moon was not observed 

 having any reference to the water-mark. The highest water-mark 

 was also in the W. monsoon, and especially in December. 



At Muntok in the Straits of Borneo. 



At this place, a decided stream of ebb and flood took place, and the 

 observations seem therefore most fit to establish on them a general 

 rule for the tides within the Archipelago, and the short or middle 

 tides. The flood stream at Muntok runs six or eight hours in a day to 

 the S. E. with a velocity of quarter, half, and sometimes of one and a half 

 mile, while the ebb stream runs sixteen or eighteen hours every day, 

 at the rate of one or two miles to W. by N. and W. N. W. The 

 turn of the streams was not regular, nor to be brought into connexion 

 with the rise and fall of the tide. In August, an ebb was even observed 

 lasting more than thirty-eight hours, while the water in the mean time 

 rises twice. 



After the monsoons, the common duration of the rise generally 

 is ten hours, and that of the fall 14-30 ; afterwards at the first and 

 last quarters of the moon, ebbs and floods, or the so-called short tides 

 take place in one day, which last about six hours, or rather the mean 

 duration of two rises is about 11-30, and that of two falls 12-35. 



The short tides ordinarily appear at a certain suspension of the 

 fall or rise in the ebb and flood tide, called by the natives passing 

 Jtetjil. Should these tides amount to two ebbs and two floods 

 in a day, they are called by the natives, "passing onok;' while ebb 

 and flood, which run for a longer time, and precede the common tides 

 of ebb and flood of twenty -four hours duration, bear the name of 

 "passing ma." 



On the contrary, during the change of the monsoons, that is during 

 April, May, October, and November, these middle tides run at new 

 and full moon ; and here also as at Onrust, flood tide occurs during the 

 West monsoon, in the afternoon and in the evening, and at new and 

 full moon at 8h. 30m. 



