president’s address. 
485 
are powerless to assist immigration. From time to time there 
have arisen such variations or mutations, often correlated, no 
doubt, with structural changes, which have rendered immigra- 
tion possible in spite of all obstacles. 
The problem of the present relation between the fauna of 
fresh water and that of the sea is one which concerns the 
physiological chemist even more than the biologist, and has to 
do with the nature of the adaptability of certain species or 
groups of species which enables them to surmount obstacles 
which are complete barriers to others. 
II. 
THE TOPOGRAPHY AND VEGETATION OF THE 
NATIONAL TRUST RESERVE KNOWN AS 
BLAKENEY POINT, NORFOLK. 
By Prof. F. W. Oliver, F.R.S., and E. J. Salisbury, 
D.Sc., F.L.S. 
The object of the present paper is to present an epitome of 
the salient facts of the constitution and distribution of the plant 
populations of the well-defined area of maritime waste lands 
known as Blakeney Point, an area which has recently been 
brought under the National Trust as a Nature Reserve, with 
the express intention that the natural conditions which have 
prevailed in the past shall continue in operation without inter- 
ference, at any rate from human agency. 
Since the year 1910, Blakeney Point, long famous for its 
bird life and known to botanists as a locality for rare and 
interesting shore plants, 1 has been the theatre of systematic 
vegetation studies at the hands of organised parties. The work 
of collecting and correlating the data of plant distribution was 
1. The late Prof. Babington. the well-known British botanist, records visiting 
Blakeney Point and colleeiiug plants there, May 23rd, 1824.— Memorials, 
Journals, etc.” 
VOL. IX. C 
1 
