OCEAN CURRENTS 



181 



has entered through the English Channel is visible. In March 

 a further flooding by Atlantic water has taken place. 



The influx of water, therefore, may be considered to 

 commence in August, and reach its maximum in the following 

 spring. After that its area diminishes. Drift-bottle experi- 

 ments in the North Sea have been made by the Scottish 



Salinity of 

 Surface-water, 

 March. 1904. 



FIG. 37. NORTH SEA SALINITIES, MARCH, 1904. 



Fishery Board between September, 1894, to the spring, 1897. 

 According to Fulton, 3,553 bottles were set free, some from 

 fishing boats, others from steamers from Leith to Christian- 

 sund, Hamburg and Rotterdam. Of these, about one-sixth 

 (572) were subsequently recovered. Their drift is shown in 

 Fig. 38. Those liberated on the English side were mainly 

 recovered north of Flamborough Head, many from the west 



