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SA-FISUERIES LABORATORY. DN I 
About an hour before low-water on the shore the 
young flood begins to set to the south through the Calf 
Sound, while the tidai ebb streams are still running in the 
neighbourhood in the opposite direction. 
The Worth Channel tidal stream reaches the 
Tsleé> of Man about Contrary Head, and turns to 
flow northwards to Point of Ayre as the tide 
[eect the north of the Island it joms a 
branch of the main northern tide running eastwards, 
and they sweep round the Point of Ayre as a strong race, 
which sets across Ramsey Bay and the shallow banks 
outside, and continuing south meets the southern tide off 
Maughold Head and turns with it to run outwards towards 
the Lancashire coast at Morecambe Bay. 
When the tide turns all these currents are reversed, 
and the ebb runs to the north from Maughold Head, 
round Point of Ayre, and down the west coast to 
Contrary Head, where it meets the ebb tide which sets 
southwards from Maughold Head, round Langness, 
through the Calf Sound, and northwards up the west 
coast past Port Erin and Niarbyl. 
It is seen from the above description that the flood 
tide runs past Port HKrin from Contrary Head to the Calf 
Sound, and up the east side of the Island to Maughold 
Head, where, if the time of high-water is past, the ebb 
tide will be found setting to the north round Point of 
Ayre and down the west side to Contrary Head. It is 
thus possible, by choosing the right time, to carry the tide 
practically the whole way round the Island when going 
south-about from Port Hrin on a young flood. This 1s 
what we did on August 14th when taking the series of 
surface temperatures recorded in this report at the points 
numbered (1) to (17) on the Chart (fig. 9). 
All these tidal streams become greatly increased in 
