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ANNUAL REPORT SMITHSONIAN INSTITUTION, 1934 



morning low water. At Honolulu, conditions are the exact reverse 

 of those at Seattle, for at the former place the differences between 

 morning and afternoon tides are exhibited principally by the high 

 waters. It is of interest to note, too, that, during the last 2 days, 

 the afternoon low waters at Seattle did not fall as low as sea level, 

 while at Honolulu the morning high waters did not rise as high as 

 sea level. 



In contrast with conditions at Seattle and Honolulu, the tide 

 curve for San Diego shows the differences between morning and 

 afternoon tides to be exhibited in approximately equal degree by 



Figure 3. — Tide curves, Galveston anil Manila, May 28—81. 



both high and low waters. The tide curve for San Diego looks much 

 like that at San Francisco shown in the bottom diagram of figure 1. 

 At the latter place, however, it is seen that there is a greater dif- 

 ference between the two low waters of a day than between the high 

 waters. 



Now it is a well-known fact that at any place the tide has local 

 features with regard to times of high and low water, range of tide, 

 or characteristics of rise and fall which distinguish it from the tide 

 at other places. But in the tides represented in figures 1 and 2, 

 time and range were disregarded, and the features considered were 

 not minor differences but characteristics of a fundamental nature. 

 In other words the tides at these places constitute distinct varieties. 



