( 184 ) 
Correction for Si, K, P Correct. values 
em. em. 
May 101.9 1,70 2,27 — 2.72 103.2 
June 117.0 1.70 — 3.24 — 2.50 113.0 
July 124,4 747 1570 — 7.88 — 1.62 116.6 
August 134.4 1.70 —10.41 —0.31 125.4 
September 124.9 1.70 —10.15 1.09 117.5 
October 105.8 1570 — 7.17 2.20 102.5 
November De 1.70 — 2.27 2.72 100.3 
December 90.3 1.70 3.24 2.50 97.7 
January 101.8 1.70 7.88 1.62 113.0 
February 102.3 1.70 10.41 0.31 114.7 
March 104.9 1.70 10.15 —1.09 115.7 
April 109.7 aye) 7.17 — 2.20 116.4 
Mean 109.6 170 111.33 
‚The corrected monthly means exhibit a principal maximum (low 
water) in August and a principal minimum (high water) in Decem- 
ber; owing to the abnormal low value in May the position of 
the secondary extremes is doubtful. 
The constants for Sa and Ssa, computed from these data, therefore 
do not give more than a rather rough approximation of the actual 
state of affairs. 
The following expression is found: 
W = 111.33 + 5.54 cos (30° t — 28°55!) +. 9.48 cos (60° t — 190°50') 
in which the origin of time coincides with May 16%. 
As might have been expected the accordance between the observed 
and calculated monthly departures from the annual mean leaves 
much to be desired: 
Observed. Calculated. 
em. em. 
May — 8.1 — 4.03 
June 1.7 — 0.37 
July 5.3 7.41 
August 14.1 11.56 
September 6.2 5.81 
Oetober — 8,8 88 
November —11.0 —13.73 
December —13.6 ae 
January 17 — 1.78 
February 3.4 6.20 
March 4,4 6.02 
April Bil 20 1d 
