122 
CHRISTIE. 
of the tide or from excess or deficiency in its computed 
value. Dr. Bakhuyzen finds for the half range 
mm. 
a x = 8.2; 
and he reduces the tide to Berlin and gives the Julian date 
of maximum latitude as derived therefrom, and also as de¬ 
rived from astronomical observations. Turning the San 
Francisco tide forward to Berlin we have: 
Julian Date of Maximum Latitude of Berlin. 
Julian date. 
Bakhuyzen, from astronomical observations.... 2405141 
“ from Helder tides... 201 
Christie, from San Francisco tides .... 153 ± 16, 
a reasonably satisfactory accord. 
