Additional Notes on the Deep Currevfs in the North Sea. 7 



part of the channel between Shetland and the Faeroes," but that 

 " there was not sufficient material available for a definite conclusion 

 on this point." Again, Dr. A. J. Robertson, in his report on the work 

 of 1907-8,* with the help of Captain Brown's earlier experiments, was 

 able to show that the cold deep-water area tallied precisely with what 

 these current-experiments suggested (if they did not yet completely 

 prove), and that this deep, cold water formed the centre of a circular 

 movement, itself remaining more or less in a state of rest. And (not 

 to speak of many other references to the same phenomenon), my own 

 charts of the salinity of the North Seaf showed that just in this region 

 we have an area of minimal variation of salinity, the salinity here at the 

 bottom varying less than "l^/OO during the year. In short, all our 

 information regarding this area now hangs well together, and the slow 

 cyclonic eddy in the deep waters, with an all but stagnant " core," may 

 be looked upon as a fact settled by observation and experiment. 



♦Fourth Report [4893], 1900, p. 149. 

 t Fourth Report, p. 89, etc. 



D'Arcy W. Thompson. 



