(244 ) 



I recorded the current between Semarang and Cheribon and between 

 Semarang and Soerabaja during a stay at the former place and found 

 it to be of the same type and strength as the current between Batavia 

 and Cheribon. The current between Batavia and Anjer however, 

 though bearing also this same type, 1 found to be more than four 

 times stronger. Experiments made specially for that purpose giving 

 evidence of the reality of this phenomenon, the next step to be done 

 was to examine the current between Batavia and other .places situated 

 between Anjer and Cheribon. In the months of March and April of 

 this year T made these measurements, having recorded during some 

 nights the current for each station in connection with Batavia, together 

 with the Batavia — Anjer current and the N S component of mag- 

 netic force. 



I measured on the diagram obtained the amplitudes for a certain 

 number of oscillations of short and of longer duration; the average 

 values are given below. For each case I have added the proportion 

 of the strength of the currents (per K.M.) to that of the Anjer-current. 

 (See table p. 245). 



When we examine the numbers of the last column, which give 

 the proportion of the strength of the currents between Batavia and 

 Anjer we at once see that for each case this proportion is nearly 

 the same for shorter and longer oscillations (only for Batavia- 

 Bekassi we find an exception, the numbers being 1.9 and 1.3 resp.). 



Now this means that also for different regions between Anjer and 

 Cheribon the currents bear the type of the coast-plains of northern 

 Java, as was mentioned above. 



But the numbers also point to a gradual increase of strength, 

 when we connect successively Batavia with places of an increasing 

 westerly position. 



Supposing the current between Batavia and Cheribon to be 1.0, 



