(187) 
It is, therefore, as vet impossible to offer an explanation of this 
peculiar behaviour of the S, tide and we can only state that spring 
and neap near Telok Betong occur 1,64, and at Java’s 4% Point 
2,87 days after New and Full Moon and First and Last Quarter. 
It must be remarked however, that the constants S9 near Java’s 
4th Point are not quite exact owing to the fact that they had to be 
calculated from observations taken thrice daily, whilst (as appears 
from formulae (1)), for the complete determination of W, S,.and 8S, 
at least five independent — i. e. not 6 or 12 hour distant) data 
are required. 
In calculating the S, constants, therefore, it is assumed either 
that S, is small with respect to Sg, or that the kappa-number of 
Sj (land- and seabreeze) is about 65° or 245°, in which case, for 
the hours of 9 a.m., 2 and 6 p.m., the influence of S, disappears 
altogether. 
In fact the seabreeze at most places causes high water about 4 
or 5 p.m. and, with the exception of only a few places, e. g. Semarang, 
the amplitude of Sj is insignificant everywhere in the Archipelago. 
The neglect of S, therefore, cannot in most cases have any 
appreciable influence on the determination of the S;-constants and 
it is principially for this reason that, for the greater part of the 
tidal stations, the above mentioned hours of observation have been 
selected. 
In this special case, moreover, it is highly improbable that the 
kappanumbers of S3 for Java's 4 Point would undergo a decrease 
if it were possible to correct for the neglect of S|, because, if we 
assume for Sj the same kappanumber as near Telok Betong, viz. 
27°, the kappanumber of S, becomes 285° instead of 280° so that 
the difference would increase rather than decrease. 
The tides of long duration Sa and Ssa may be considered to run 
pretty well parellel if allowance is made for the fact that the 
constants have been calculated from observations made during 
different periods. 
II. Sabang-bay. 
In this bay of the isle of Weh or Waat situated north of Sumatra’s 
most northerly point in 5°54' N. Lat. and 95°20' KE. Long., tidal 
observations have been made since June 15% 1897 at the hours of 
T a.m., 11 a.m. and 4 p.m. 
The results calculated from the first year-series may be given 
here and, for the sake of comparison, also the constants for the 
road of Oleh-leh. 
