1899] THE FAUNA OF THE SOUND 273 



municates with the sea at one end, and which is subject to a varying 

 influx, in the one case, of fresh water, in the other of brackish water ; 

 in either case with the same result. Oresund especially is like a fjord, 

 since the bank between Malmo and Saltholm forms a sill which 

 prevents the deeper and Salter layers of water from flowing right 

 through into the Baltic. Those are the conditions that in great 

 measure explain the composition of the fauna of the Sound. 



The first paper ends with " some words on the vegetation of 

 Oresund." Although the details are not full enough for any argument 

 to be based on them, it is noteworthy that of the forms mentioned 

 only two are lacking within the polar circle. At all events the facts 

 corroborate the views above expressed regarding the origin of the fauna 

 of the Sound. 



The second paper presents a more detailed study of the extreme 

 southern portion of Oresund. It contains many facts of scientific and 

 practical interest, especially concerning the herring. But here we can 

 only note that the general statements and explanations of the former 

 paper are fully confirmed. 



British Museum 

 (Natural History), 



London, S.W. 



