VARIETY IN TIDES MARMER 



189 



6 p. m. In fact, it appears that the natives use the same word for 

 midnight as for high water. At Tahiti, therefore, the tide is solar 

 rather than lunar. 



The range of the tide at Tahiti is small, less than a foot on the 

 average. A better example of the solar type of tide has recently 

 come to light at Tuesday Island, a small island in Torres Strait, 

 lying about 15 miles northwesterly from the northern point of the 



Figure 5. — Tide curves, Tuesday Island, Sept. 10-10, 1925. 



Australian mainland. Here the range of the tide averages nearly 

 5 feet. The peculiar behavior of the tide here with regard to time 

 is clearly brought out if the tide curves for a number of days are 

 arranged in column, as in figure 5, which represents the tide curves 

 for each day of the week beginning September 10, 1925. 



It will be noted that the high and low waters in this figure fall 

 practically in a vertical line; which means that instead of coming 

 later each day by about 50 minutes, which is the state of affairs at 



