218 



Part III. — Seventeenth Annual fieport 

 TABLE IV. 



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he 5 



Reference to these Tables shows that the mean minimum temperature 

 of the surface and bottom water is in March, and the mean maximum 

 temperature of both in August. In February and early in September the 

 temperature of the surface and bottom water is the same. It is, how- 

 ever, the changes in the temperature of the water at the bottom that 

 chiefly concern us here, for although the gurnard not infrequently leaves 

 the bottom, especially, as we shall see, during the night, it is typically a 



