SURVEY AND COMPARISON 175
has a fairly wide range of salinity tolerance as it
occurs in the creeks near the railway and also at the
seaward end of Creek 7.
A more complete picture of the effects of inning could be
achieved if it was possible to carry out further estimations
of chloride content in various parts of the area studied, and
if this area could be compared with other similar ones higher
up the Thames.
My thanks are due to my father for help in copying the
map outlines from the Ordnance Survey Maps, to Mr. A.
Vines (Municipal College, Southend) for the photographs,
and to Mr. H. F. dribble for typing the work.
Nomenclature adopted in this paper follows that of The Flora of the
British Isles by Clapham, Tutin and Warburg.