64 University of California Publications in Zoology [ Vou. 14 
TABLE 18—(Continued) 
Division 
of Bay Station Surface Bottom Flood Ebb Average* 
1 4975 13.21 17.27 13.64 16.85 15.24 
(17%) 4976 14.23 17.16 (15.64)+ (15.74)+ 15.69 
4977 15.46 19.25 17.57 17.13 17.35 
4978 19.45 21.55 (21.69)+ (19.31)t 19.62 
4979 23.32 25.60 25.25 23.68 24.46 
4980 23.97 26.00 (25.81)t (24.15)t 24.98 
4981 23.96 26.72 (25.49) t (25.19)t 25.33 
4 5001 28.76 28.97 28.82 28.91 28.86 
(37%) 5002 28.80 28.99 28.67 29.11 28.90 
5003 28.67 28.69 28.51 28.86 28.68 
5004 28.77¥ 28.58 28.41 28.93 28.67 
5005 28.24 28.71 28.37 28.58 28.47 
5006 28.39 28.61 28.51 28.49 28.50 
5007 28.49 29.05 28.61 28.93 28.76 
5008 28.44 29.86 28.86 29.44 29.14 
bo 
Means (weighted) 26.769 28.192 26.881 27.573 27.480 
Divisions of the Bay 
Divisions 
Surface Bottom Fload Ebb Average* 
1 19.084 21.9386 18.816 19.221 20.509 
2 24.936 27.540 25.910 26.570 26.239 
3 29.054 30.570 29.198 30.426 29.810 
4 28.571 28.932 28.595 28.906 28.751 
* Mean of surface and bottom. 
7 Figures thus designated are not included in the estimates, because of the omission of 
certain observations at these stations. They are consequently not comparable with the figures 
for the other stations. 
With the exception of plate 4, all of the salinity charts are based 
upon our figures as they were before the correction of 2.3 per cent 
above referred to (p. 58) had been applied. The ordinates of these 
charts consequently do not quite agree with the corresponding figures 
in the tables, though the form of the curves is not in any case appreci- 
ably altered. The more exact value for any station and period may be 
found if desired by reference to the tables. 
Plate 4 represents the mean annual salinity at each of the twenty- 
three regular hydrographic stations of the survey, each figure being 
based normally upon twenty-four determinations, at six different 
periods of the year. 
In figure L these same relations are represented by the method of 
coordinates, and separate curves have here been plotted for surface 
