12 On the Tides of the Western Coast of the United Siates. 
Diurnal inequality in intervals and heights of pile ag low water at San Francisco, 
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The foregoing table shows the diurnal inequality in time and 
height of high and low water at the three places before named. 
“he whole difference in height and interval between the A. M. 
and P.M. tides is taken as representing the diurnal inequality, 
and no correction is made for the half-monthly inequality in pre- 
paring the tables. I may observe that upon trying the correc- 
tions with the half-monthly pened. as at present determined, 
no special advantage resulted; and until the half-monthly ine- 
quality is determined by more nnigeeots observations, I adhere 
to this form of discussion. 
The sual are shown in diagram No. 2, in which the ordi- 
nates denote the inequality in interval and height on the days 
from zero of declination of the ‘moon, denoted by the absciss@- 
The dots show the act tual o and one are drawn 
