INVESTIGATION OF OYSTER SPAWNING, ETC., MILFORD, CONN. 



443 



The relationships between the mean air and water temperatures for July, 1925 

 and 1926, apparently are contradictory in view of the fact that the water was 

 1.9" C. lower in 1926, though the air temperature was actually higher than in 1925. 

 However, under the circumstances this is what we would expect because of the differ- 

 ence in the water temperatures on July 1, which were 2.3° C. higher in 1925. 



The influence that the air temperature exerts on the temperature of the water is 

 modified to a great extent by wind, precipitation, river discharge, range of tide, and 



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JULY AUGU5T 



Figure 7.— Comparison of mean daily air and water temperatures, together with daily precipitation 



the area of tidal flats. The relationship between the air and water temperatures for 

 the summers of 1925 and 1926 is shown clearly in Figure 7. The two curves do not 

 coincide, but, as one would expect, the water curve follows the air curve with a slight 

 lag and less amplitude. A rise in air temperature is followed about 24 hours later 

 by a less prominent rise in water temperature. This is due largely to the fact that 

 the thermal capacity of water is about three thousand times that of the air. Records 

 of the New Haven station of the United States Weather Bureau show that the mean 

 20701—29 2 



