66 A TEXTBOOK OF OCEANOGRAPHY 



In the Irish Sea the water is at its coldest in February. 

 The progress of the drift from the Channel into Liverpool Bay 

 is now clearly seen (Fig. n). 



FIG. 13. MIGRATION OF MARKED PLAICE IN THE IRISH SEA AND 

 ITS RELATION TO WATER TEMPERATURES. 



The period of maximum temperature is attained in August. 

 The highest temperatures are now near the coast (Fig. 12), 

 this being exactly the opposite of the conditions obtaining in 

 winter. In the Irish Sea the sea is cooling down towards the 



