On the Tides of the Western Coast of the United States. 11 
ria, from July 11 to October 31, 1853; at San Francisco, from 
January 17 to February 15, 1852, and from January 5 to Feb- 
ruary 26, 1853; and at San Diego, from September 22 to No- 
vember 31, 1853. All the observations were made with Sax- 
ton’s self-registering gauge. I submit specimens of the actual 
those formerly produced for San Francisco. : 
he crude corrected establishment for the three places is— 
For Astoria. - x 2 : - 12h. 58m. 
For San Francisco,  - - - - - 12 4 
For San Diego, ee 
The value of A (the tangent of the difference of luni-tidal in- 
terval for three and for nine hours) and of E of Mr. Lubbock’s 
notation, (half the difference in height of neap and spring tides 
divided by 2 A) are, for— 
} Data for A. Logie E. 
Places, h—h' 
|  Intime, | Tn are. oe 
Astoria, 7.2... Th. 08m. | 17°80" | 031 | 268 
San Francisco,. . Pp ib18 i: Piae g0o)) wee 159 
ON cn bc ce Se ce [1 36 31.30 | 039 | 171 
These, of course, are but approximations. 
