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 MusrEuM 
(Natural History), 
Lonpon, 8. W. 
